Não informado. (1969). Man-environment Systems. Association for the Study of Man-Environment Relations.
Citação do estilo Chicago (17ª ed.)Não informado. Man-environment Systems. Orange, NJ: Association for the Study of Man-Environment Relations, 1969.
Citação MLA (8ª ed.)Não informado. Man-environment Systems. Association for the Study of Man-Environment Relations, 1969.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.