Antopina, Cristalyn U. The Level of Use of Mother Tongue and the English Language Proficiency Among Tausug Students in Hagonoy High School/ Cristalyn U. Antopina, Hannah G. Diez and Jessie C. Lazar. - Digos City: UMDC March 2011. - 69 pages; 28 cm. Subjects--Topical Terms: Education--Undergraduate thesis. --English Dewey Class. No.: UT 0846 / An88