Arar, E. J., & Collins, G. B. (1997). Method 445.0: In vitro determination of chlorophyll a and pheophytin a in marine and freshwater algae by fluorescence (Revision 1.2.). United States Environmental Protection Agency, Office of Research and Development, National Exposure Research Laboratory.
Chicago Style (17th ed.) CitationArar, Elizabeth J., and Gary B. Collins. Method 445.0: In Vitro Determination of Chlorophyll a and Pheophytin a in Marine and Freshwater Algae by Fluorescence. Revision 1.2. [Cincinnati, Ohio]: United States Environmental Protection Agency, Office of Research and Development, National Exposure Research Laboratory, 1997.
MLA (9th ed.) CitationArar, Elizabeth J., and Gary B. Collins. Method 445.0: In Vitro Determination of Chlorophyll a and Pheophytin a in Marine and Freshwater Algae by Fluorescence. Revision 1.2. United States Environmental Protection Agency, Office of Research and Development, National Exposure Research Laboratory, 1997.