In AMA style your bibliography should be called Reference List.
Within your Reference List, your references should be listed in numerical order (two references should not be combined under a single reference number) as opposed to alphabetically. The numerical order is based on the order in which the sources were first cited in the document.
Do not begin the reference list on a new page, but place it at the end of your document, after a space or a line. It follows any article information or acknowledgments. Put the word "References" in all caps, and in line with the left-hand margin. Format the numbers as per normal numbering style, single spaced.
REFERENCES