LIU, G. (2005). The Singapore foreign service: The first 40 years. Editions Didier Millet.
Chicago-čujuhus (17. p.)LIU, Gretchen. The Singapore Foreign Service: The First 40 Years. Editions Didier Millet, 2005.
MLA-čujuhus (9. p.)LIU, Gretchen. The Singapore Foreign Service: The First 40 Years. Editions Didier Millet, 2005.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.