Gaya APA
Cavanaugh, J, C., Blanchard-Fields, F. (2015).
Adult Development and Aging : 7th Edition .
Amerika:
Cengage Learning.
Gaya MLA
Cavanaugh, John, C., Blanchard-Fields, Fredda.
"Adult Development and Aging : 7th Edition".
Amerika:
Cengage Learning,
2015.
Text.