Gaya APA

Dewey, M. et al (1989). Dewey Decimal Classification and Relative Index Edition 20 Volume 4 : Relative Index - Manual (Edition 20). New York: Forest Press.

Gaya MLA

Dewey, Meivil. et al. "Dewey Decimal Classification and Relative Index Edition 20 Volume 4 : Relative Index - Manual". Edition 20 New York: Forest Press, 1989. Text.