Osborn, Annie Marion
Oxford University Press, 1940
Buku Teks
Mornet, Daniel
Hatier-Boivin, 1950
Buku Teks
Rousseau, Jean-Jacques, 1712-1778, author
Seghers , 1968
Buku Teks
Routledge, 2000
Buku Teks
Wanlass, Lawrence C., author
Appleton-Century-Crofts, 1953
Buku Teks