5 1 30 Riduwan Primary Author mixed material 9786022893295 Bandung ALVABETA,CV 2018 WhatsApp_Image_2026-01-21_at_12.19.34.jpeg.jpeg Riduwan Primary Author mixed material 9788433084 Bandung Alfabeta 2023 Screenshot_%28129%29.png.png Riduwan Primary Author mixed material 9786028361125 Bandung Alfabeta 2018 METODE_%26_TEKNIK_MENYUSUN_PROPOSAL_PENELITIAN_014.jpg.jpg Riduwan Primary Author mixed material 9786022893295 Bandung Alfabeta 2018 CARA_MUDAH_MENYUSUN_SKRIPSI_%26_TUGAS_AKHIR043.jpg.jpg Riduwan Primary Author mixed material 9798433723 Bandung Alfabeta 2003