Cita APA (7a ed.)

Gardner, K. B., Willetts, P., & Willison, I. R. General rules for the supply of photographs and ordinary applications.

Cita Chicago Style (17a ed.)

Gardner, Kenneth B., Pamela Willetts, y I. R. Willison. General Rules for the Supply of Photographs and Ordinary Applications.

Cita MLA (9a ed.)

Gardner, Kenneth B., et al. General Rules for the Supply of Photographs and Ordinary Applications.