APA Style

Hartanto, Rudy. (). Kesukaran belajar . : .

Chicago Style

Hartanto, Rudy. Kesukaran belajar . : , . .

MLA Style

Hartanto, Rudy. Kesukaran belajar . : , . .

Turabian Style

Hartanto, Rudy. Kesukaran belajar . : , . .