APA-Zitierstil (7. Ausg.)
(1990). Science Year 1991: The World Book Annual. Science Supplement. A review of Science and Technology During the 1990 School Year. The World Book,Inc.
Chicago-Zitierstil (17. Ausg.)
Science Year 1991: The World Book Annual. Science Supplement. A Review of Science and Technology During the 1990 School Year. Chicago: The World Book,Inc, 1990.
MLA-Zitierstil (9. Ausg.)
Science Year 1991: The World Book Annual. Science Supplement. A Review of Science and Technology During the 1990 School Year. The World Book,Inc, 1990.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.