Cita APA (7a ed.)

Cottrell, D., & Nix, R. (2013). Indispensable! becoming the obvious choice in business and in life (First edition.). McGraw-Hill.

Cita Chicago Style (17a ed.)

Cottrell, David, y Robert Nix. Indispensable! Becoming the Obvious Choice in Business and in Life. First edition. New York: McGraw-Hill, 2013.

Cita MLA (8a ed.)

Cottrell, David, y Robert Nix. Indispensable! Becoming the Obvious Choice in Business and in Life. First edition. McGraw-Hill, 2013.