Gaya APA

Feldman, R, S., Schwartzbberg, S, S. (1990). Thinking critically : a psychology student's guide . New York: McGraw-Hill, Inc..

Gaya MLA

Feldman, Robert, S., Schwartzbberg, Steven, S. "Thinking critically : a psychology student's guide". New York: McGraw-Hill, Inc., 1990. Text.