APA ציטוט

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

Trích dẫn kiểu Chicago

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

ציטוט MLA

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