APA (7th ed.) Citation

Kropotkine , P., Piroshnikoff , J. R., Friedland , L. S., & Lebedev , N. (1947). Ethics: Origin and development. Tudor.

Chicago Style (17th ed.) Citation

Kropotkine , Pierre, Joseph R. Piroshnikoff , Louis S. Friedland , and N. Lebedev. Ethics: Origin and Development. Tudor, 1947.

MLA (8th ed.) Citation

Kropotkine , Pierre, et al. Ethics: Origin and Development. Tudor, 1947.