Citazione Stile APA (7a Edizione)
(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.
Citazione stile Chigago Style (17a edizione)
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.
Citatione MLA (9a ed.)
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.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.