GuritnoD.P., Qiram ikhwanul and SartikaD. 2018. Pengaruh Jarak Kerapatan Penghalang Spiral Terhadap Unjuk Kerja Kolektor Surya Tipe Plat Datar. V-MAC (Virtual of Mechanical Engineering Article). 3, 1 (Apr. 2018), 9-12.