Pro Juventute. (1970). Verlags-Katalog 1970. Pro Juventute.
Cita Chicago (17th ed.)Pro Juventute. Verlags-Katalog 1970. Zürich: Pro Juventute, 1970.
Cita MLA (8th ed.)Pro Juventute. Verlags-Katalog 1970. Pro Juventute, 1970.
Atenció: Aquestes cites poden no estar 100% correctes.