Carlson, Fred A., author
Prentice-Hall, 1952
Buku Teks
Cayrou, Gaston
Didier, 1948
Buku Referensi
Jansen, H.P.H., author
AULA, 1993
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Gómez, Marte R.
Fondo de Cultura Económica,, 1974
Buku Teks
Olvier Zunz [and others], editor
Russel Sage Foundation, 2001
Buku Teks