APA Citation

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.

MLA Citation

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

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