Ziglar, Zig
Heinemann Asia, 1995
Buku Teks
Rosenblatt, Joe
Press Porcepic, 1976
Buku Teks
Priestley, J. B. (John Boynton), 1894-1984
Alison & Busby, 1968
Buku Teks
Rusmini
Gramedia Widiasarana Indonesia, 2019
Koleksi Publik
Firth, John Rupert
Watts, 1937
Buku Teks