@INBOOK {KANG:1989c, title = {Alley cropping for food crop production in the humid and subhumid tropics}, author = {Kang, B. and Van der Kruijs, A. C. M. B. and Couper, D. C. }, year = {1989}, type = {Alley farming in the humid and subhumid tropics}, pages = {16--26}, publisher = {IDRC}, address = {Ottawa}, }