Riduwan. Skala Pengukuran Variabel-Variabel Penelitian. Alfabetha.
Chicago Style (17th ed.) CitationRiduwan. Skala Pengukuran Variabel-Variabel Penelitian. Alfabetha.
MLA (8th ed.) CitationRiduwan. Skala Pengukuran Variabel-Variabel Penelitian. Alfabetha.
Warning: These citations may not always be 100% accurate.