Kolvenbach, Jur Walter
Kluwer Deventer, 1979
Buku Teks
Kolvenbach, Walter
Kluwer, 1979
Buku Teks
Hill, Norman L., author
Stanford University Press, 1929
Buku Teks
Schein, Edgar H., author
Addison-Wesley, 1969
Buku Teks
Goodspeed, Stephen S., author
Oxford University Press, 1963
Buku Teks