Gaya APA

Chicago, T, U, O. (1768). Knowledge in Depth: Volume I (Aalto - Arithmetic) (15). United States of America: Helen Hemingway Benton Publisher.

Gaya MLA

Chicago, The, University, Of. "Knowledge in Depth: Volume I (Aalto - Arithmetic)". 15 United States of America: Helen Hemingway Benton Publisher, 1768. Text.