Tài liệu tham khảo

WikiPedia: Vịnh Bái Tử Long http://halongcity.gov.vn/vpages/heritage.asp http://baitulongnationalpark.vn/Main.aspx?MNU=1313... http://english.toquoc.gov.vn/vietnam/viewNew.asp?n... http://baitulongnationalpark.vn/Main.aspx?MNU=1312... http://baitulongnationalpark.vn/Main.aspx?MNU=1311... http://baitulongnationalpark.vn/Main.aspx?MNU=1276... http://www.thanhnien.com.vn/news/pages/200441/9764... http://tuoitre.vn/Tin-tuc/250706/Vuon-quoc-gia-Bai... http://www.qdnd.vn/qdndsite/vi-VN/71/5/449/psa/Def... http://www.sggp.org.vn/doisonghanoi/2007/7/109429/