APA (7a ed.)

Richards, D. T., Hoole, D., Lewis, J. W., Ewens, E., & Arme, C. (1994). Ultrastructural observations on the cellular response of carp, Cyprinus carpio L., to eggs of the blood fluke Sanguinicola inermis Plehn, 1905 (Trematoda : sanguinicolidae). Journal of Fish Diseases.