APA (7th ed.) Citation

Kropff, A., & Chivers, S. P. (1969). The art of plastic modeling. A Grenadier Book.

Chicago Style (17th ed.) Citation

Kropff, Al, and Sydney P. Chivers. The Art of Plastic Modeling. Canoga Park, Calif.: A Grenadier Book, 1969.

MLA (9th ed.) Citation

Kropff, Al, and Sydney P. Chivers. The Art of Plastic Modeling. A Grenadier Book, 1969.