Hersey, Rexford
Zest for work : industry rediscovers the individual / Rexford Hersey
Harper , 1955
 Buku Teks
Consultants and consulting organizations directory : a reference guide to concerns and individuals engaged in consultation for business, industry, and government
edited by Janice McLean
Gale Research, 1991
 Buku Referensi
Bayu Perkasa Temadja
Analisis strategi pemasaran jasa di industri headhunter (studi kasus PT. Global Liaquat Consulting) = Analysis of service marketing strategy in the headhunter industry (case study ofP7T Global Liaquat Consulting)
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2010
 UI - Tesis Open
Gendelman, Joel
Consulting basics
American Society for Training & Development, 2010
 eBooks
Cope, Mick
The seven Cs of consulting : the definitive guide to the consulting process
Financial Times Prentice Hall, 2003
 Buku Teks