Rentsch, Tim (1 September 1982). "Object oriented programming". ACM SIGPLAN Notices. 17 (9): 51–57. doi:10.1145/947955.947961. S2CID 14373518. /wiki/Doi_(identifier)
Coplien, James O. (1999). Multi-paradigm design for C++ (3rd printing ed.). Reading, Mass. [u.a.]: Addison-Wesley. ISBN 978-0-201-82467-4. 978-0-201-82467-4
Lutz, Mark (2013). Learning Python: Powerful Object-Oriented Programming. "O'Reilly Media, Inc.". ISBN 9781449355692. 9781449355692
Flanagan, David; Matsumoto, Yukihiro (2008). The Ruby programming language (1st ed.). Beijing: O'Reilly. ISBN 978-0596554651. 978-0596554651