APA
Hejko M., . (1999). Asteroid 2374. Praha: World Circle Foundation.
Chicago
Hejko Mykola, . 1999. Asteroid 2374. Praha: World Circle Foundation.
Harvard
Hejko M., . (1999). Asteroid 2374. Praha: World Circle Foundation.
MLA
Hejko Mykola, . Asteroid 2374. Praha: World Circle Foundation. 1999.