Vreeland, N., & Maday, B. C. (1977). Area handbook for Singapore. For sale by the Supt. of Docs., U.S. Govt. Print. Off..
Chicago-viite (17. p.)Vreeland, Nena, ja Bela C. Maday. Area Handbook for Singapore. Washington: For sale by the Supt. of Docs., U.S. Govt. Print. Off., 1977.
MLA-viite (8. p.)Vreeland, Nena, ja Bela C. Maday. Area Handbook for Singapore. For sale by the Supt. of Docs., U.S. Govt. Print. Off., 1977.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.