Lombard, George F.F.
Harvard University, Division of Research, Graduate School of Business Administration, 1955
Buku Teks
Ocko, Judy Young.
Fairchild Publications , 1961
Buku Teks
Tri Andi, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2012
UI - Skripsi Open
Dyonisius Beti, author
1990
UI - Tesis Membership
Lutfiah Rachmawati, author
2017
UI - Skripsi Membership