Tilson, Ronald Lewis. <br/><br/>
Monogamous mating systems of gibbons and langurs in the Mentawai Islands, Indonesia  [microform] / 
by Ronald Lewis Tilson. 
 - Ann Arbor, Mich. :  University Microfilms International,  1981. 
 - 1 microfilm reel :  positive ;  35 mm. 
<br/><br/>Thesis (Ph.D.) - University of California, 1980. 
<br/><br/><label>ISBN: </label>Y910040399 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Gibbons--Sexual behavior.<br/>Presbytis--Sexual behavior.