and metropolitan areas of the United States 美国行政管理和预算局 Statistical area (United States)(英语:Statistical area (United States)) Combined statistical area (聯合統計區)
Hoa, A phonological contrastive study of Vietnamese and English (PDF), Lubbock, Texas: Texas Technological College, 1965 [2018-02-23], (原始内容存档 (PDF)于2015-10-01)