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Métodos de investigación social /

By Goode, William J.. Mexico : Edit. F. Trillas, S.A.; 1967 . 469 paginas ; 23 cm..

By Woodhouse, C.M. Mexico : Edit.F.Trillas SA, 1965 . 115 paginas ; 20 cm..

By Conquest, Robert. Mexico : Edit.F.Trillas, 1966 . 99 paginas ; 20 cm..

By National Council of Teachers of Mathematics. México : Edit. F. Trillas, 1970 . 109 paginas ; 23 cm..