Gaya APA

Asbury, G, M, G, F, R. (1973). Human Relations Development : a manual for educators . United States of America: Allyn and Bacon, Inc..

Gaya MLA

Asbury, George, M., Gazda,, Frank, R.. "Human Relations Development : a manual for educators". United States of America: Allyn and Bacon, Inc., 1973. Text.