Asfiandy, Dommy. "Sejarah Perusahaan". PT Petrokimia Gresik Official Website (in Indonesian). Archived from the original on 2018-08-21. Retrieved 2019-02-16.
Asfiandy, Dommy. "Kapasitas Produksi". PT Petrokimia Gresik Official Website (in Indonesian). Archived from the original on 2018-08-21. Retrieved 2019-02-16.
"Laporan Tahunan 2021"(PDF) (in Indonesian). PT Petrokimia Gresik. Retrieved 8 March 2023.
web.archive.org
Asfiandy, Dommy. "Sejarah Perusahaan". PT Petrokimia Gresik Official Website (in Indonesian). Archived from the original on 2018-08-21. Retrieved 2019-02-16.
Asfiandy, Dommy. "Kapasitas Produksi". PT Petrokimia Gresik Official Website (in Indonesian). Archived from the original on 2018-08-21. Retrieved 2019-02-16.