THANH, Trần Đức.
 Về phân loại bản đồ du lịch.
<strong>VNU Journal of Science: Natural Sciences and Technology</strong>, [S.l.], v. 9, n. 4, dec. 1993.
ISSN 2588-1140.
Available at: &lt;<a href="https://js.vnu.edu.vn/NST/article/view/4247" target="_new">https://js.vnu.edu.vn/NST/article/view/4247</a>&gt;. Date accessed: 07 may 2024.