The majority of AIP Journals use the superscript method for in-text citation. This means that there is a small, raised number, such as a 1,2,3 after the punctuation of a referenced content. These superscripts will be used in order of mention, so superscript 1 is used first, superscript 2 is used second, etc. Finally, a reference list of at the end of the article should be used in superscript order to give the full citation.
Alternative Arrangement:
Some AIP journals allow you to use the (Author Name, Year) in-text citation format. If you use this format, Arrange your reference list in alphabetical order.