Παραπομπή APA

Blumenthal, L. M., & Menger, K. (1970). Studies in geometry. San Francisco.

Παραπομπή Chicago Style

Blumenthal, Leonard M., και Karl Menger. Studies in Geometry. San Francisco, 1970.

Παραπομπή MLA

Blumenthal, Leonard M., και Karl Menger. Studies in Geometry. San Francisco, 1970.