Tingley, Judith C., author
American Management Association;;, 1996
eBooks
Scott, Kim, author
Pan Books, 2019
Buku Teks
Rosenfeld, Isadore, author
Random House, 1996
Buku Referensi
Benson, Peter L., author
Interaksara, 2007
Buku Teks
Ruby, Fellexandro, author
PT Gramedia Pustaka Utama, 2022
Buku Teks