APA-viite (7. p.)
Opperman, C., & Villiers, M. d. (2015). Determine the true value of learning and development. Knowres Publishing.
Chicago-viite (17. p.)
Opperman, Catherina, ja Marlene de Villiers. Determine the True Value of Learning and Development. Randburg, South Africa: Knowres Publishing, 2015.
MLA-viite (9. p.)
Opperman, Catherina, ja Marlene de Villiers. Determine the True Value of Learning and Development. Knowres Publishing, 2015.
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