APA
GROMAN J., . (1995). The World Book Encyclopedia 20. Chicago: World Book International.
Chicago
GROMAN Jeff, . 1995. The World Book Encyclopedia 20. Chicago: World Book International.
Harvard
GROMAN J., . (1995). The World Book Encyclopedia 20. Chicago: World Book International.
MLA
GROMAN Jeff, . The World Book Encyclopedia 20. Chicago: World Book International. 1995.