Gaya APA

Duffy, K, G. (2000). Psychology : Annual Edition (Ed.13) (Ed.13). New York: Mc Graw Hill Book Co..

Gaya MLA

Duffy, Karen, G.. "Psychology : Annual Edition (Ed.13)". Ed.13 New York: Mc Graw Hill Book Co., 2000. PASCA-ILMU PEMERINTAHAN.