APA (7th ed.) Citation

Kropotkine , P., Piroshnikoff , J. R., Friedland , L. S., Lebedev , N., & Keell , T. H. (1926). Ethics: Origin and development. George G. Harrap.

Chicago Style (17th ed.) Citation

Kropotkine , Pierre, Joseph R. Piroshnikoff , Louis S. Friedland , N. Lebedev , and Thomas H. Keell. Ethics: Origin and Development. George G. Harrap, 1926.

MLA (8th ed.) Citation

Kropotkine , Pierre, et al. Ethics: Origin and Development. George G. Harrap, 1926.