http://repository.uhamka.ac.id/id/eprint/10246/
Iba, Khairil
http://repository.uhamka.ac.id/id/eprint/10246/1/STATISTIK%204H.pdf
Fans Buya Hamka
http://repository.uhamka.ac.id/id/eprint/10246/
Iba, Khairil
http://repository.uhamka.ac.id/id/eprint/10246/1/STATISTIK%204H.pdf