6 1 20 Eka Sri Yusmartini Additional Author Eko Ariyanto Additional Author Haidi Primary Author mixed material 9786230289804 Merisha Hastarina Primary Author Eko Ariyanto Primary Author Yetty Hastiana Primary Author Robiah Primary Author Zulkiffli Saleh Primary Author mixed material 9786230279782 Merisha Hastarina Primary Author Eko Ariyanto Primary Author Zulkifli Saleh Primary Author Yetty Hastiana Primary Author Robiah Primary Author mixed material 9786230279782 Cekmas Cekdin Additional Author Eka Sri Yusmartini Additional Author Eko Ariyanto Primary Author mixed material 9786230286933 Dr. Eko Ariyanto, M.chem.eng Primary Author Dr. Ir.Cekmas Cekdin, M.T Primary Author Dr. Ir. Eka Sri Yusmartini, M.T Primary Author mixed material 9786230286933 Eko Ariyanto Primary Author Atikah Additional Author Radius Perdana Wira Admaja Additional Author mixed material 9786230275678