APA-viite

Northrup, P. T. (2007). Learning objects for instruction: Design and evaluation. Information Science pub.

Chicago-tyylinen lähdeviittaus

Northrup, Pamela T. Learning Objects for Instruction: Design and Evaluation. New York: Information Science pub, 2007.

MLA-viite

Northrup, Pamela T. Learning Objects for Instruction: Design and Evaluation. Information Science pub, 2007.