Clardy, Alan
The management training tool kit : 35 exercises to prepare managers for the challenges they face every day
Amacom, 2012
 Buku Teks
Disney, Walt
Story a day: for every day of the year
Glorier International, INC, 1978
 Buku Teks
Levithan, David
Every day = Setiap hari
PT. Gramedia Pustaka Utama, 2018
 Buku Teks
Lovelock, Christopher H.
Marketing challenges : cases and exercises
McGraw-Hill, 1985
 Buku Teks
Lovelock, Christopher H.
Marketing challenges : cases abd exercises
McGraww-Hill, 1993
 Buku Teks