Cita APA

Ludwig, E. (1931). Gifts of life: A retrospect. London: G. P. Putnam's Sons.

Chicago Style Citation

Ludwig, Emil. Gifts of Life: A Retrospect. London: G. P. Putnam's Sons, 1931.

Cita MLA

Ludwig, Emil. Gifts of Life: A Retrospect. London: G. P. Putnam's Sons, 1931.

Atenció: Aquestes cites poden no estar 100% correctes.