Vreeland, N., & Maday, B. C. (1977). Area handbook for Singapore (First edition.). U.S. Government Printing Office.
Lua i Stíl Chicago (17ú heag.)Vreeland, Nena, agus Bela C. Maday. Area Handbook for Singapore. First edition. Washington, D.C.: U.S. Government Printing Office, 1977.
Lua MLA (8ú heag.)Vreeland, Nena, agus Bela C. Maday. Area Handbook for Singapore. First edition. U.S. Government Printing Office, 1977.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.