APA (7th ed.) Citation

Gallagher, Armitage, & Hasting. (2005). Total English: Elementary. Longman.

Chicago Style (17th ed.) Citation

Gallagher, Armitage, and Hasting. Total English: Elementary. England: Longman, 2005.

MLA (8th ed.) Citation

Gallagher, et al. Total English: Elementary. Longman, 2005.