APA (7th ed.) Citation

Royal Botanic Gardens, Kew, Forman, L., & Bridson, D. M. (1989). The Herbarium handbook. Royal Botanic Gardens.

Chicago Style (17th ed.) Citation

Royal Botanic Gardens, Kew, Leonard Forman, and Diane M. Bridson. The Herbarium Handbook. Kew: Royal Botanic Gardens, 1989.

MLA (9th ed.) Citation

Royal Botanic Gardens, Kew, et al. The Herbarium Handbook. Royal Botanic Gardens, 1989.