APA

Liu G., . (2005). The Singapore Foreign Service. london: Didier Millet.

Chicago

Liu Gretchen, . 2005. The Singapore Foreign Service. london: Didier Millet.

Harvard

Liu G., . (2005). The Singapore Foreign Service. london: Didier Millet.

MLA

Liu Gretchen, . The Singapore Foreign Service. london: Didier Millet. 2005.