(Ingelesez)Graham, Lawrence D. (1999). Legal battles that shaped the computer industry. Greenwood Publishing Group, 175 or. ISBN978-1-56720-178-9. Aipua: «Freeware, however, is generally only free in terms of price; the author typically retains all other rights, including the rights to copy, distribute, and make derivative works from the software.».
Dixon, Rod. (2004). Open source software law. Artech House ISBN978-1-58053-719-3. (Noiz kontsultatua: 2024-11-19) Aipua: «On the other hand, freeware does not require any payment from the licensee or end-user, but it is not precisely free software, despite the fact that to an end-user the software is acquired in what appears to be an identical manner.».
(Ingelesez)Lyons, Kelly; Messinger, Paul R.; Niu, Run H.; Stroulia, Eleni. (2012). «A tale of two pricing systems for services» Information Systems and E-Business Management 10 (1): 19–42. doi:10.1007/s10257-010-0151-3. ISSN1617-9846..
(Ingelesez)Lyons, Kelly; Messinger, Paul R.; Niu, Run H.; Stroulia, Eleni. (2012). «A tale of two pricing systems for services» Information Systems and E-Business Management 10 (1): 19–42. doi:10.1007/s10257-010-0151-3. ISSN1617-9846..