Cita APA (7a ed.)

Fletcher, G. L., Smith, H. O., & Harrow, B. (1929). Beginning chemistry. American book Co.

Cita Chicago Style (17a ed.)

Fletcher, Gustav L., Herbert O. Smith, y Benjamin Harrow. Beginning Chemistry. New York, Cincinnati [etc.]: American book Co, 1929.

Cita MLA (8a ed.)

Fletcher, Gustav L., et al. Beginning Chemistry. American book Co, 1929.