Analysis of information sources in references of the Wikipedia article "Đài thiên văn Lowell" in Vietnamese language version.
|journal= (trợ giúp) and Accompanying six photos, exterior, from 1964 and 1976 Lưu trữ 2013-10-21 tại Wayback Machine|journal= (trợ giúp) and Accompanying six photos, exterior, from 1964 and 1976 Lưu trữ 2013-10-21 tại Wayback Machine