G.S. Campbell؛ J.M. Norman (1989)۔ "The description and measurement of plant canopy structure"۔ در Graham Russell؛ Bruce Marshall؛ Paul G. Jarvis (مدیران)۔ Plant Canopies: Their Growth, Form and Function۔ Cambridge University Press۔ ص 1–19۔ DOI:10.1017/CBO9780511752308.002۔ ISBN:978-0-521-39563-2۔ LCCN:87032902
G.S. Campbell؛ J.M. Norman (1989)۔ "The description and measurement of plant canopy structure"۔ در Graham Russell؛ Bruce Marshall؛ Paul G. Jarvis (مدیران)۔ Plant Canopies: Their Growth, Form and Function۔ Cambridge University Press۔ ص 1–19۔ DOI:10.1017/CBO9780511752308.002۔ ISBN:978-0-521-39563-2۔ LCCN:87032902
Robert K.M. Hay؛ John R. Porter (2006)۔ The Physiology of Crop Yield (Second ایڈیشن)۔ Blackwell Publishing۔ ISBN:978-1-4051-0859-1۔ LCCN:2006005216