APA

Wulf W. A., Levin R. & Harbison S. P. (1981). Hydra-C.mmp. New York u.a: McGraw-Hill.

Chicago

Wulf William A, Levin Roy and Harbison Samuel P. 1981. Hydra-C.mmp. New York u.a: McGraw-Hill.

Harvard

Wulf W. A., Levin R. and Harbison S. P. (1981). Hydra-C.mmp. New York u.a: McGraw-Hill.

MLA

Wulf William A, Levin Roy and Harbison Samuel P. Hydra-C.mmp. New York u.a: McGraw-Hill. 1981.