Reader's Digest Association, Harris, E., & Harris, J. (1981). Field guide to the trees and shrubs of Britain / edited and designed by The Reader's Digest Association. Reader's Digest Association.
Chicago Style (17th ed.) CitationReader's Digest Association, Esmond Harris, and Jeanette Harris. Field Guide to the Trees and Shrubs of Britain / Edited and Designed by The Reader's Digest Association. London: Reader's Digest Association, 1981.
MLA (9th ed.) CitationReader's Digest Association, et al. Field Guide to the Trees and Shrubs of Britain / Edited and Designed by The Reader's Digest Association. Reader's Digest Association, 1981.
Warning: These citations may not always be 100% accurate.