APA (7th ed.) Citation

Stein, E., & Stein, W. (1970). On the problem of empathy (2d ed.). M. Nijhoff.

Chicago Style (17th ed.) Citation

Stein, Edith, and Waltraut Stein. On the Problem of Empathy. 2d ed. The Hague: M. Nijhoff, 1970.

MLA (9th ed.) Citation

Stein, Edith, and Waltraut Stein. On the Problem of Empathy. 2d ed. M. Nijhoff, 1970.