Glencoe Publishing Co & Foster, D. (1999). Interactive mathematics: Activities & investigations (Student resource book.). Glencoe/McGraw Hill.
Lua i Stíl Chicago (17ú heag.)Glencoe Publishing Co agus David Foster. Interactive Mathematics: Activities & Investigations. Student resource book. New York: Glencoe/McGraw Hill, 1999.
Lua MLA (8ú heag.)Glencoe Publishing Co agus David Foster. Interactive Mathematics: Activities & Investigations. Student resource book. Glencoe/McGraw Hill, 1999.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.