APA

Hooper A., . (1945). The river mathematics. New York: H. Holt and company.

Chicago

Hooper A, . 1945. The river mathematics. New York: H. Holt and company.

Harvard

Hooper A., . (1945). The river mathematics. New York: H. Holt and company.

MLA

Hooper A, . The river mathematics. New York: H. Holt and company. 1945.