Gaya APA

Bordens, K, S., Abbott, B, B. (2008). Research Design and Methods : A Process Approach 7'th Edition (7). New York: McGraw-Hill Companies.

Gaya MLA

Bordens, Kenneth, S.., Abbott, Bruce, B.. "Research Design and Methods : A Process Approach 7'th Edition". 7 New York: McGraw-Hill Companies, 2008. Text.