Huynh, L. M. T., Huynh, C. T. T., Le, H. Y., & Phan, T. M. D. (2010). An analysis of English simple past tense and present perfect tense errors made by the grade 10- students at Cao Lanh City High School: B.A Thesis. Major: English Pedagogy. Degree: Bachelor of Art. Dong Thap: Dong Thap University.

Huynh, Le Minh Trung, Cam Thao Trang Huynh, Hoang Yen Le, ja Thi My Dung Phan. An Analysis of English Simple Past Tense and Present Perfect Tense Errors Made By the Grade 10- Students At Cao Lanh City High School: B.A Thesis. Major: English Pedagogy. Degree: Bachelor of Art. Dong Thap: Dong Thap University, 2010.

Huynh, Le Minh Trung, Cam Thao Trang Huynh, Hoang Yen Le, ja Thi My Dung Phan. An Analysis of English Simple Past Tense and Present Perfect Tense Errors Made By the Grade 10- Students At Cao Lanh City High School: B.A Thesis. Major: English Pedagogy. Degree: Bachelor of Art. Dong Thap: Dong Thap University, 2010.