Niles, Mary Cushing
The essence of management
Harper & Brothers, 1958
 Buku Teks
Hiltrop, Jean Marie
The essence of negotiation
Prentice-Hall, 1995
 Buku Teks
Parkinson, Cyril Northcote, 1909-1993
The essence of managment
Federal Publications, [Date of publication not identified]
 Buku Teks
Huxley, Aldous, 1894-1963
Ape and essence
Bantam, 1958
 Buku Teks SO
Walters, John
The essence of Buddhism
Thomas Y. Crowell, 1964
 Buku Teks SO