Lua APA (7ú heag.)
(1991). Science year 1991: A review of science and technology during the 1990 school year. World Book, Inc.
Lua i Stíl Chicago (17ú heag.)
Science Year 1991: A Review of Science and Technology During the 1990 School Year. Chicago: World Book, Inc, 1991.
Lua MLA (9ú heag.)
Science Year 1991: A Review of Science and Technology During the 1990 School Year. World Book, Inc, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.