Gaya APA

Bordens, K, S., Abbott, B, B. (1998). Research Design and Methods: A process approach (Edisi 4). California: Mayfield Publishing Company.

Gaya MLA

Bordens, Kenneth, S.., Abbott, Bruce, B.. "Research Design and Methods: A process approach". Edisi 4 California: Mayfield Publishing Company, 1998. Text.