edited by Harold M. Groves
Henry Holt Company , 1950
Buku Teks
Rahadi
Universitas Indonesia, 1998
UI - Tesis (Membership)
Maria Carmelia Widiastuti
1996
UI - Tesis (Membership)
Appleton-Century-Crofts, 1966
Buku Teks
Lutz, Harley Leist
D. Appleton-Century, 1947
Buku Teks