Hashim Ali
Comprehensive economics guide
Oxford University Press, 1999
 Buku Teks SO
Nersesian, Roy L.
Ships and shipping : a comprehensive guide
PennWell, 1981
 Buku Teks
Betz, Frederick
Strategic thinking: a comprehensive guide
Emerald, 2016
 eBooks
Zerwekh, JoAnn Graham
Nclex-rn: a comprehensive study guide
Nursing Education Consultans , 2000
 Buku Teks SO
The haig comprehensive guide to British tourism
editor, Cecil Turner
Best Western, 1980
 Buku Referensi