Gaya APA

Cartwright, C, A., Cartwright, G, P. (1984). Developing Observation Skills Ed. 2'nd (2). New York: McGraw-Hill.

Gaya MLA

Cartwright, Carol, A.., Cartwright, G., Philip. "Developing Observation Skills Ed. 2'nd". 2 New York: McGraw-Hill, 1984. Text.