Cita APA (7th ed.)
(1967). International astronomical union. Union astronomique internationale. Symposium. Academic Press.
Cita Chicago (17th ed.)
International Astronomical Union. Union Astronomique Internationale. Symposium. New York: Academic Press, 1967.
Cita MLA (9th ed.)
International Astronomical Union. Union Astronomique Internationale. Symposium. Academic Press, 1967.
Atenció: Aquestes cites poden no estar 100% correctes.