APA-viite

Thorpe,Edgar, & Thorpe,Showick. (2003). Objective english. Pearson Education.

Chicago-tyylinen lähdeviittaus

Thorpe,Edgar, ja Thorpe,Showick. Objective English. New Delhi: Pearson Education, 2003.

MLA-viite

Thorpe,Edgar, ja Thorpe,Showick. Objective English. Pearson Education, 2003.