Gaya APA

O'BRIEN, J, W., WASSERMAN, S, R. (1990). STATISTIK SOURCES, THIRTEENTH EDITION 1990 (ED.13). DETROIT: GALE RESEARCH INC..

Gaya MLA

O'BRIEN, JACQUELINE, WASSERMAN., WASSERMAN, STEVEN, R.. "STATISTIK SOURCES, THIRTEENTH EDITION 1990". ED.13 DETROIT: GALE RESEARCH INC., 1990. Umum.