STERLING, R., FARNAN, W. T., & CARMODY, J. (1982). Earth sheltered residental design manual: Undergroundspace center University of Minnesota. Van Nostrand Reinhold.
Dyfyniad Arddull ChicagoSTERLING, Raymond, William T. FARNAN, and John CARMODY. Earth Sheltered Residental Design Manual: Undergroundspace Center University of Minnesota. New York: Van Nostrand Reinhold, 1982.
Dyfyniad MLASTERLING, Raymond, et al. Earth Sheltered Residental Design Manual: Undergroundspace Center University of Minnesota. Van Nostrand Reinhold, 1982.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.