The style guidelines of the American Psychological Association (APA) for references to journal articles calls for them to be formatted as follows:

    Author's last name, author's first and middle initial.  (Year of publication).  Article title.  Journal Name, volume number, page numbers.

A few pointers:

• All names should be inverted (last name first), followed by the author's initial(s) and a period after each initial.  Separate multiple authors' names by commas.  The last author in a list of two or more authors should be preceded by an ampersand (the "&" sign).  List all authors in the same order in which they appear in the article.
• For the title of the article, capitalize only the first word of the title, the first word following a semi-colon in the title and any proper nouns:  e.g. Three strikes laws in California:  Good policy or good politics?
• Capitalize and underline the name of the journal.  Separate the volume number from the name of the journal by a comma and underline the volume number as well.
• Give the full range of page numbers of the article.

If you retrieve the article from an electronic source as opposed to a paper copy available in the library or through inter-library loan, refer to the APA's guidelines for instruction on how to add a notation about the electronic retrieval.