Siregar, Hasrul Sani <br/><br/>
Membangun masa depan Natuna / 
Hasrul Sani Siregar 
 - Pekanbaru :  Penerbit Unri Press,  2004 
 - 68 p. ;  20 cm. 
<br/><br/><label>ISBN: </label>9793297948  Hadiah 
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Riau (Indonesia)--Economic conditions