1. BPPT. Outlook Energi Indonesia 2018. Jakarta: Pusat Pengkajian Industri Proses dan Energi (PPIPE), Badan Pengkajian dan Penerapan Teknologi (BPPT). 2018.
2. SKK Migas. “Laporan tahunan SKK Migas 2016,” Jakarta. 2017.
3. Solid oxide fuel cells;Ormerod;Chem. Soc. Rev.,2003
4. Preparation of proton selective membranes through constructing H+ transfer channels by acid-base pairs;Ge;J. Memb. Sci.,2015
5. Materials Science for Energy Technologies Synthesis and characterization of heteropolyacid (H 3 PW 12 O 40) embedded poly (vinyl alcohol) -g-acrylamide copolymeric membranes and their evaluation for proton exchange membrane fuel cells;Patil;Mater. Sci. Energy Technol.,2020