Cita APA (7th ed.)

Penrose Productions, Addison-Wesley Pub. Co, Penrose, J., Johnson, G. P., & Leyden, M. B. (1988). The Elements. Penrose Productions.

Cita Chicago (17th ed.)

Penrose Productions, Addison-Wesley Pub. Co, Jim Penrose, Gordon P. Johnson, i Michael B. Leyden. The Elements. [United States]: Penrose Productions, 1988.

Cita MLA (8th ed.)

Penrose Productions, et al. The Elements. Penrose Productions, 1988.