Gaya APA

LABOVITZ, S., HAGEDORN, R. (1981). Introduction to social research (3rd.ed). New York: Mc Graw-Hill Book Company.

Gaya MLA

LABOVITZ, Sanford., HAGEDORN, Robert. "Introduction to social research". 3rd.ed New York: Mc Graw-Hill Book Company, 1981. .