Groot, H. C. (2011). Peace Corps Alumni Foundation for Philippine Development. Bulletin of the American Historical Collection.
Chicago-viite (17. p.)Groot, Hans C. "Peace Corps Alumni Foundation for Philippine Development." Bulletin of the American Historical Collection 2011.
MLA-viite (9. p.)Groot, Hans C. "Peace Corps Alumni Foundation for Philippine Development." Bulletin of the American Historical Collection, 2011.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.