Gaya APA

Metodologi Research, jilid 2. (1989). : .

Gaya Chicago

Metodologi Research, jilid 2. . : , 1989. .

Gaya MLA

Metodologi Research, jilid 2. . : , 1989. .

Gaya Turabian

Metodologi Research, jilid 2. : , 1989. .