Chanida Sanguansab และ Thaweesakdi Boonkerd. (2008) Diversity of ferns and fern allies at Khao Nan Yai, Khao Nan National Park, Nakhon Si Thammarat Province. Chulalongkorn University:ม.ป.ท.Chanida Sanguansab และ Thaweesakdi Boonkerd. 2008. Diversity of ferns and fern allies at Khao Nan Yai, Khao Nan National Park, Nakhon Si Thammarat Province. ม.ป.ท.:Chulalongkorn University;Chanida Sanguansab และ Thaweesakdi Boonkerd. Diversity of ferns and fern allies at Khao Nan Yai, Khao Nan National Park, Nakhon Si Thammarat Province. ม.ป.ท.:Chulalongkorn University, 2008. Print.