APA (7th ed.) Citation

Penrose, G., Nostbakken, J., & Baillie, M. (1989). Dr. Zed's science surprises. Greey de Pencier Books.

Chicago Style (17th ed.) Citation

Penrose, Gordon, Janis Nostbakken, and Marilyn Baillie. Dr. Zed's Science Surprises. Toronto: Greey de Pencier Books, 1989.

MLA (9th ed.) Citation

Penrose, Gordon, et al. Dr. Zed's Science Surprises. Greey de Pencier Books, 1989.