If the journal uses references numbered in order of citation, then no alphabetical arrangement is needed. Copy and paste the authors' names as they appear in the text, then number the references. Then add numbers to the references in the text. Because some references will be cited more than once, the numbers in the text will not always be in numerical order. Check that every reference in the text has a number, and right at the last minute delete the names and dates from the text.
Some journals use their own abbreviations.
One-word periodical titles are never abbreviated. You can check abbreviations for biological periodicals on line using the WWW site Biological Journals and Abbreviations. If writing a thesis, decide which system you prefer for periodical titles and stick to it rigidly and consistently. Multiple Authors Note the journal's rules for multiple authors of a paper. Most Harvard System journals use one or two authors' names only in the text.