(1980). In Gagarin's trail. Moscow: Novosti.
Cita Chicago (17th ed.)In Gagarin's Trail. Moscow: Novosti, 1980.
Cita MLA (8th ed.)In Gagarin's Trail. Moscow: Novosti, 1980.
Atenció: Aquestes cites poden no estar 100% correctes.
Cita APA (7th ed.)