Gaya APA

Krajcik, J, S. et al (2003). Teaching science in elementary and middle school classrooms: aproject-based approach . Boston, Massachusetts: Mc Graw-Hill.

Gaya MLA

Krajcik, Joseph, S.. et al. "Teaching science in elementary and middle school classrooms: aproject-based approach". Boston, Massachusetts: Mc Graw-Hill, 2003. Text.