Citazione Stile APA (7a Edizione)

Wills, J. C. (1997). Strategic planning: The ASTD trainer's sourcebook. McGraw-Hill.

Citazione stile Chigago Style (17a edizione)

Wills, John C. Strategic Planning: The ASTD Trainer's Sourcebook. New York: McGraw-Hill, 1997.

Citatione MLA (9a ed.)

Wills, John C. Strategic Planning: The ASTD Trainer's Sourcebook. McGraw-Hill, 1997.