Cita APA (7a ed.)

Krabbe, H., Sabine, G. H., & Shepard, W. J. (1922). The modern idea of the state. D. Appleton.

Cita Chicago Style (17a ed.)

Krabbe, H., George H. Sabine, y Walter J. Shepard. The Modern Idea of the State. New York [etc.]: D. Appleton, 1922.

Cita MLA (9a ed.)

Krabbe, H., et al. The Modern Idea of the State. D. Appleton, 1922.