Gaya APA

Riduwan, . (2005, 2008, 2013,201). Skala pengukuran variabel-variabel penelitian / Riduwan (Cet. 3, 5,10,11). : .

Gaya MLA

Riduwan, . "Skala pengukuran variabel-variabel penelitian / Riduwan". Cet. 3, 5,10,11 : , 2005, 2008, 2013,201. Textbook.