APA (7th ed.) Citation

National Science Teachers Association & Penick, J. E. (1985). Earth science. National Science Teachers Association.

Chicago Style (17th ed.) Citation

National Science Teachers Association and John E. Penick. Earth Science. Washington, D.C: National Science Teachers Association, 1985.

MLA (9th ed.) Citation

National Science Teachers Association and John E. Penick. Earth Science. National Science Teachers Association, 1985.