By Ryan, Peter. Harlow, England ; | New York : Addison-Wesley, 2001 . xiv, 300 p. : 24 cm.. 0201674718

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By Ryan, Peter.. Lisboa : Europa-América, 1983 . 219 p. :

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By Ryan, Camille D., e outro. , In: Environment and planning - C. - ISSN 0263 774X. - Vol. 22, nº 2 (Abr. 2004). - p. 217-232

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By Ryan, Peter F.. . pp. 11-12

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