Cita APA (7a ed.)

Cooper, K. S., Sorensen, C. W., & Todd, L. P. (1961). Learning to look at our world. Silver Burdett.

Cita Chicago Style (17a ed.)

Cooper, Kenneth S., Clarence W. Sorensen, y Lewis Paul Todd. Learning to Look at Our World. Morristown, NJ: Silver Burdett, 1961.

Cita MLA (9a ed.)

Cooper, Kenneth S., et al. Learning to Look at Our World. Silver Burdett, 1961.