APA

Proctor, R. A. (1890). Other worlds than ours. New York: A.L. Burt.

MLA

Proctor, Richard A. Other Worlds Than Ours. New York: A.L. Burt, 1890. Print.

CHICAGO

Proctor, Richard A. 1890. Other worlds than ours. New York: A.L. Burt.

HARVARD

PROCTOR, R. A. (1890). Other worlds than ours. New York, A.L. Burt.

TURABIAN

Proctor, Richard A. Other Worlds Than Ours. New York: A.L. Burt, 1890.