Canby, H. S. (1968). American estimates. Kennikat Press.
Cita Chicago (17th ed.)Canby, Henry Seidel. American Estimates. Port Washington, N.Y.: Kennikat Press, 1968.
Cita MLA (8th ed.)Canby, Henry Seidel. American Estimates. Kennikat Press, 1968.
Atenció: Aquestes cites poden no estar 100% correctes.