Keet, Ernest E.
Preventing piracy: a business guide to software protection / Ernest E. Keet
Addison-Wesley Publishing , 1985
 Buku Teks
Keet, Ernest E.
Preventing pirary : a business guide to software protection
Addison-Wesley, 1984
 Buku Teks SO
Ronan, Jana Smith
Chat reference: a guide to live virtual reference services
Libraries Unlimited, 2003
 Buku Teks
Burnham, Scott J.
Drafting contracts : a giude to the practical applicationof the principles of contract law
The Michie Company, 1993
 Buku Teks
Simpson, Laurence P.
Handbook of the law of contracts
West Publishing, 1954
 Buku Teks