Wheeler, James O.
Duxbury Press, 1974
Buku Teks
Wheeler, Margaret
Hart Publishing Company, 1967
Buku Teks
Wheeler, Bayard O.
Harper & Row Pub., 1962
Buku Teks
Rana Neysa Salsabila, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2021
UI - Tugas Akhir
edited by Myron H. Nordquist, John Norton Moore
Martinus Nijhoff Publishers, 1995
Buku Teks