APA (7th ed.) Citation

Humphrey, J. H., & Humphrey, J. N. (1991). Developing elementary school science concepts through active games. C.C. Thomas.

Chicago Style (17th ed.) Citation

Humphrey, James H., and Joy N. Humphrey. Developing Elementary School Science Concepts Through Active Games. Springfield, Ill., U.S.A.: C.C. Thomas, 1991.

MLA (9th ed.) Citation

Humphrey, James H., and Joy N. Humphrey. Developing Elementary School Science Concepts Through Active Games. C.C. Thomas, 1991.

Warning: These citations may not always be 100% accurate.