Bản mẫu:SfnRef/doc

Generate an identifier suitable as an anchor for a Harvard citation. This template, which can be used with either the name SfnRef or the name harvid, is intended to be paired with Harvard citation templates such as Sfn, harv, and harvnb. This templates uses the same arguments as the other citation templates. As explained below, this template is needed only in some cases when the Harvard citation templates are used.

**Cách sử dụng**
 SfnRef|Last name of author(s)|Year
or
 harvid|Last name of author(s)|Year
The first parameter is the first author's last name. Up to four authors can be given as parameters; if there are more than four authors, list only the first four. The last parameter is the year of publication, possibly with a letter suffixed to avoid ambiguity if there are multiple citations by the same set of authors in the same year.
All named parameters such as p are ignored.

**Mục đích**
This template creates the proper value for the ref parameter for use with cite journal, cite book, citation, and the other templates implemented via Chú thích/nhân, and for use by vcite journal, vcite book and other templates that generate Vancouver system references. It is intended to be paired with Sfn and uses the same arguments. As explained below, SfnRef/harvid is only necessary in a subset of the cases where Sfn is used.
creates a short footnote that is linked to a full footnote. Sfn creates the link automatically, but the full footnote must be assigned the proper ID value to be a valid target for that link.
When using the Chú thích/nhân family of citation templates, the ID is created via the ref parameter. In most cases, the parameter should be coded as harv: this generates the ID from the last names of the first four authors. This parameter setting is not needed for citation, which defaults to harv. However, if last1 etc. are not used, such as when the author of the source is unknown and the short footnote specifies an organization name, harv will not create the proper ID value. In those cases, use SfnRef to create the proper value without having to know the rules for how Sfn creates the ID.
The vcite journal etc. templates (with "vcite", not "cite") do not support harv and require the use of SfnRef/harvid to work with Harvard citations.

**Các ví dụ**
 With the shortened footnote template
When citing an article published in the December 2004 edition of Rolling Stone where the author is unknown, you might create a short footnote as follows:
 
will not work in this case because "Rolling Stone" is not the name of the author. You may code the value for the ref parameter manually, or you can use SfnRef and specify the same parameters as used with Sfn:
 
The full footnote:
 
You can copy and paste the Sfn template code and change the name of the template from "Sfn" to "SfnRef". If your short footnote includes page numbers such as , you can copy and paste it to create ; the 48 parameter is not necessary but will do no harm.
 With other Harvard templates
For example, a References section might contain the following markup:
 
This markup uses  to generate the anchor identifier "2009", used internally to link Harvard references to citations. (This identifier is not visible to the article's reader.) The generated citation looks like this:
 
Article prose can link to this citation with markup like the following:
 2009
which generates the following:
 2009
To see how it works, click on the "2009".

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