Khalifa, A. (2010). The expanding forms of preparation and participation.
Chicago-viite (17. p.)Khalifa, Ahmed. The Expanding Forms of Preparation and Participation. 2010.
MLA-viite (8. p.)Khalifa, Ahmed. The Expanding Forms of Preparation and Participation. 2010.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.