Sterling, R., Nelson, S. R., & Jaffe, M. (1983). Planning for underground space. American Planning Association.
Cita Chicago (17th ed.)Sterling, Ray, Susan R. Nelson, i Martin Jaffe. Planning for Underground Space. Chicago, IL (1313 E. 60th St., Chicago 60637): American Planning Association, 1983.
Cita MLA (8th ed.)Sterling, Ray, et al. Planning for Underground Space. American Planning Association, 1983.
Atenció: Aquestes cites poden no estar 100% correctes.