Gaya APA

Williamson, G, I. (). The Heidelberg Catechism : A Study Guide (E : 0). PHILLIPSBURG, NJ: P&R Publ..

Gaya MLA

Williamson, G., I.. "The Heidelberg Catechism : A Study Guide". E : 0 PHILLIPSBURG, NJ: P&R Publ., . Text.