Held, K., Wilkins, H., & Brown, H. J. (1979). The interaction between urbanization and land: Quality and quantity in environmental planning and design : the commercial model, technical documentation. Landscape Architecture Research Office, Graduate School of Design, Harvard University.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিHeld, Karl, Hugh Wilkins, এবং H. James Brown. The Interaction Between Urbanization and Land: Quality and Quantity in Environmental Planning and Design : The Commercial Model, Technical Documentation. Cambridge, Mass.: Landscape Architecture Research Office, Graduate School of Design, Harvard University, 1979.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিHeld, Karl, et al. The Interaction Between Urbanization and Land: Quality and Quantity in Environmental Planning and Design : The Commercial Model, Technical Documentation. Landscape Architecture Research Office, Graduate School of Design, Harvard University, 1979.