Your instructor may require you to format your paper or bibliography in American Journal of Public Health (AJPH) style. The AJPH follows AMA style. (You may also see this referred to as "APHA" style, since the American Public Health Association publishes AJPH.)
In general, AJPH follows AMA style and you may refer to the AMA Manual of Style to resolve questions about formating your references. More detail may be found in the section on style in the "AJPH Instructions for Authors" document linked below.
The most current guidelines are found in the 6th edition of the APA Manual of Style, issued in the fall of 2009.
Click on the links below to get help with using APA style.
In addition to AMA style, many scientific journals ask authors to follow the Uniform Requirements for Manuscripts Submitted to Biomedical Journals. These guidelines were developed by the International Committee of Medical Journal Editors (ICMJE) at a meeting in 1978. The meeting was held in Vancouver, Canada; hence, this style is also sometimes referred to as "the Vancouver style".
For help with ICMJE style, see the link below.