APA (7e ed.) Bronvermelding

Yorkey, R. C., Barrutia, R., & Uhl Chamot, A. English for International communication. Teacher´s edition.

Chicago (17e ed.) Bronvermelding

Yorkey, Richard C., Richard Barrutia, en Anna Uhl Chamot. English for International Communication. Teacher´s Edition.

MLA (8e ed.) Bronvermelding

Yorkey, Richard C., et al. English for International Communication. Teacher´s Edition.