Hiltrop, Jean Marie
The essence of negotiation
Prentice-Hall, 1995
 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
The essence of antropology
by William A Haviland [and others]
Wadsworth and Cengage Learning, 2013
 Buku Teks SO
Niles, Mary Cushing
The essence of management
Harper & Brothers, 1958
 Buku Teks SO