Plueddemann, C. (1990). Pilgrims in progress: Growing through groups. Harold Shaw Publishers.
Chicago-referens (17:e uppl.)Plueddemann, Carol. Pilgrims in Progress: Growing Through Groups. Wheaton, Illinois: Harold Shaw Publishers, 1990.
MLA-referens (9:e uppl.)Plueddemann, Carol. Pilgrims in Progress: Growing Through Groups. Harold Shaw Publishers, 1990.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.