Sudarwati, M. (2008). Look Ahead Book 1 An english Course for Senior High School Students Year X (SMA & MA). Erlangga.
Chicago-viite (17. p.)Sudarwati, M. Look Ahead Book 1 An English Course for Senior High School Students Year X (SMA & MA). Erlangga, 2008.
MLA-viite (8. p.)Sudarwati, M. Look Ahead Book 1 An English Course for Senior High School Students Year X (SMA & MA). Erlangga, 2008.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.