Illman, Paul E.
The pilot's air traffic control handbook
Tab Books, 1993
 Buku Referensi
Webster's legal secretaries handbook
edited by Coleen K. Withgott, Austin G. Anderson
Merriam-Webster, 1981
 Buku Referensi
Gates, Jean Key
Guide to the use of books and libraries
McGraw-Hill, 1974
 Buku Referensi
The handbook of alternative education
editor, Jerry Mintz
Macmillan, 1994
 Buku Referensi
De Vries, Mary Ann
Complete secretary's handbook
Prentice-Hall, 1991
 Buku Referensi