Cita APA (7a ed.)

Krutch, J. W. (1958). Grand Canyon: Today and all its yesterdays. William Sloane Associates.

Cita Chicago Style (17a ed.)

Krutch, Joseph Wood. Grand Canyon: Today and All Its Yesterdays. New York: William Sloane Associates, 1958.

Cita MLA (9a ed.)

Krutch, Joseph Wood. Grand Canyon: Today and All Its Yesterdays. William Sloane Associates, 1958.