Sekartjakrarini , Soehartini <br/><br/>
Ecotourism development :  a case study of Siberut Island Indonesia  [microform] / 
by Sekartjakrarini , Soehartini 
 - Ann Arbor, Mich. :  University Microfilms International,  1997 
 - 2 microfisches ;  11x 15 cm. 
<br/><br/>Thesis (Ph.D) - Texas A&M University , 1997