Freyre, G. (1961). Portuguese integration in the tropics: Notes concerning a possible Lusotropicology which would specialize in the systematic study of the ecological-social process of the integration in tropical environments of Portuguese, descendants of Portuguese and continuators of Portuguese. s. n.
Chicago-referens (17:e uppl.)Freyre, Gilbert. Portuguese Integration in the Tropics: Notes Concerning a Possible Lusotropicology Which Would Specialize in the Systematic Study of the Ecological-social Process of the Integration in Tropical Environments of Portuguese, Descendants of Portuguese and Continuators of Portuguese. Lisbon: s. n, 1961.
MLA-referens (9:e uppl.)Freyre, Gilbert. Portuguese Integration in the Tropics: Notes Concerning a Possible Lusotropicology Which Would Specialize in the Systematic Study of the Ecological-social Process of the Integration in Tropical Environments of Portuguese, Descendants of Portuguese and Continuators of Portuguese. s. n, 1961.