Gaya APA

Krajcik, J, S. et al (c2003). Teaching science in elementary and middle school classrooms: a project-based approach (2nd ed.). mau: McGraw-Hill.

Gaya MLA

Krajcik, Joseph, S.. et al. "Teaching science in elementary and middle school classrooms: a project-based approach". 2nd ed. mau: McGraw-Hill, c2003. Buku.