APA Style

Drs. Valentino Barus, dkk .. (). . : .

Chicago Style

Drs. Valentino Barus, dkk .. . : , . .

MLA Style

Drs. Valentino Barus, dkk .. . : , . .

Turabian Style

Drs. Valentino Barus, dkk .. . : , . .