APA aipamena

Echols, J. C. (1996). Penguins and their young: Teacher's guide : preschool-1. Great Explorations in Math and Science, (GEMS), Lawrence Hall of Science, University of California.

Chicago Style aipamena

Echols, Jean C. Penguins and Their Young: Teacher's Guide : Preschool-1. Berkeley, CA: Great Explorations in Math and Science, (GEMS), Lawrence Hall of Science, University of California, 1996.

MLA aipamena

Echols, Jean C. Penguins and Their Young: Teacher's Guide : Preschool-1. Great Explorations in Math and Science, (GEMS), Lawrence Hall of Science, University of California, 1996.