Sofian Effendi.
Metode penelitian survai. - Jakarta : LEMB, 1989. - Rev ed. ; cm.
Metodologi Penelitian--Analisa Data.
Q180.M593
Metode penelitian survai. - Jakarta : LEMB, 1989. - Rev ed. ; cm.
Metodologi Penelitian--Analisa Data.
Q180.M593