Gaya APA

DOWNS, R, B., KELLER, C, D. (1975). HOW TO LIBRARY RESEARCH . USA: SOUTHERN ILLINOIS UNIVERSITY PRESS.

Gaya MLA

DOWNS, ROBERT, B.., KELLER, CLARA, D.. "HOW TO LIBRARY RESEARCH". USA: SOUTHERN ILLINOIS UNIVERSITY PRESS, 1975. Koleksi Khusus.