UNITED NATIONS GROUP OF EXPERTS ON GEOGRAPHICAL NAMES (UNGEGN)
Recognizing the need to adopt a single system for the romanization of the Khmer writing system,
Recommends that the system set out in document E/CONF.61/L.5/Add.181 be accepted as the standard international system for the writing of Khmer geographical names in the Roman alphabet.
1 – Second United Nations Conference on the Standardization of Geographical Names: Vol. II. Technical papers, 1972, p. 163.