na INLIS000000000004442 20130515144008 ind 979-8767-235-1 0010-051300000004442 ind 001.4 001.4 Nasution, Metode Research (Penelitian Ilmiah) Edisi : 1; Cetakan : 8 Jakarta Bumi Akasara 2006 viii, 156 hlm. : ilus. ;20,5 cm. Penelitian