Gaya APA

Swanson, C, P., Tuyl, G, H, V. (1953). Manual and key to mathematics at work . New York: New York: American Book; 1953..

Gaya MLA

Swanson, Carl, P.., Tuyl, George, H., Van. "Manual and key to mathematics at work". New York: New York: American Book; 1953., 1953. Text.