O`Neill, William L.
Harper & Row Publishers, 1975
Buku Teks
edited by Richard Mann
Gateway Books, 1995
Buku Teks SO
Harvard Business School Press, 2004
Buku Teks
Christie, Agatha, 1890-1976
Gramedia Pustaka Utama, 2017
Buku Teks
Hewett, Dorothy
Currency Press, 1976
Buku Teks