Siregar, Anitaria
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2016
UI - Tesis Membership
Gupta, Kamal
Tata McGraw-Hill, 1981
Buku Teks
Culey, Ray T.
South-Western Publishing, 1953
Buku Teks
Silvoso, Joseph A.
Ohio South-Western, 1965
Buku Teks
Mulyadi
Salemba Empat, 2002
Buku Teks