John Paul II, P. (1980). Christ tells youth how to be happy. Daughters of St. Paul.
Chicago-viite (17. p.)John Paul II, Pope. Christ Tells Youth How to Be Happy. Boston, Mass.: Daughters of St. Paul, 1980.
MLA-viite (8. p.)John Paul II, Pope. Christ Tells Youth How to Be Happy. Daughters of St. Paul, 1980.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.