Yudin, Daniel L
Gramedia Pustaka Utama, 1999
Buku Teks
Aaker, David A.
John Wiley & Sons, 1984
Buku Teks
FEUI - Management Research Center (MRC), {s.a}
Majalah, Jurnal, Buletin
N.Y. Honaver House , 1955
Buku Teks
Lola Delvira
Fakultas Ekonomi dan BIsnis Universitas Indonesia, 2020
UI - Skripsi Membership