These publish research reports by scientists addressed to scientists. If the article's style is breezy or journalistic, if the research method is not described in a fair amount of detail, or if it doesn't include any references to other research, it is probably not appropriate for this assignment. These would not be appropriate for most literature reviews. If we don't subscribe to the journal, fill out an interlibrary loan request. Include your name and the bar code from your ID card.
Articles typically take up to a week to arrive, so plan ahead.