Tilson, Ronald Lewis. <br/><br/>
Monogamous mating systems of gibbons and langurs in the Mentawai Islands, Indonesia / 
Ronald Lewis Tilson. 
 - Davis :  University of California,  1980. 
 - 121 p. :  ill., maps ;  21 cm. 
<br/><br/>Thesis (Ph.D.) - University of California, 1980. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Gibbons.<br/>Presbytis.<br/>Courtship of animals.<br/>Sexual behavior in animals.