Kroeber, E., Wolff, W. H., & Bleifeld, M. (1965). Key: Biology, second edition. Workbook and laboratory manual. D. C. Heath and Co..
Čikaški stil citiranja (17. izdanje)Kroeber, Elsbeth, Walter H. Wolff, i Maurice Bleifeld. Key: Biology, Second Edition. Workbook and Laboratory Manual. [Boston]: D. C. Heath and Co., 1965.
MLA način citiranja (8. izdanje)Kroeber, Elsbeth, et al. Key: Biology, Second Edition. Workbook and Laboratory Manual. D. C. Heath and Co., 1965.
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