Elwell, Fayette H.
Ginn & Co, 1949
Buku Teks
Carlson, Paul A.
South Western, 1957
Buku Teks
Sheff, Alexander L.
The Blakiston , 1944
Buku Teks
Raxel Edo Bramasta
Fakultas Ilmu Administrasi Universitas Indonesia, 2020
UI - Skripsi (Membership)
Cousins, Donald
English Universities Press , 1955
Buku Teks