Cita APA (7th ed.)
Lack, R. (2002). Signposts in life. GLIFA.
Cita Chicago (17th ed.)
Lack, Rudi. Signposts in Life. Krattigen, Switzerland: GLIFA, 2002.
Cita MLA (9th ed.)
Lack, Rudi. Signposts in Life. GLIFA, 2002.
Atenció: Aquestes cites poden no estar 100% correctes.