APA Edition Citation

O'Hehir, R. E., Holgate, S. T., & Sheikh, A. Middleton's allergy essentials (First edition.).

Chicago Edition Citation

O'Hehir, Robyn E., S. T. Holgate, and Aziz Sheikh. Middleton's Allergy Essentials. First edition.

MLA Edition Citation

O'Hehir, Robyn E., et al. Middleton's Allergy Essentials. First edition.