Citazione Stile APA (7a Edizione)

Opperman, C., & Villiers, M. d. (2015). Determine the true value of learning and development. Knowres Publishing.

Citazione stile Chigago Style (17a edizione)

Opperman, Catherina, e Marlene de Villiers. Determine the True Value of Learning and Development. Randburg, South Africa: Knowres Publishing, 2015.

Citatione MLA (9a ed.)

Opperman, Catherina, e Marlene de Villiers. Determine the True Value of Learning and Development. Knowres Publishing, 2015.