(1997). Interview with Mr. Engineer Abdullah Kopaei (Chairman of the Board of Directors of Engineers Consulting for Design and Research of Water and Wastewater). Journal of Water and Wastewater; Ab va Fazilab (in persian), 7(4), 58-61. doi: 10.22093/wwj.1997.173989

. "Interview with Mr. Engineer Abdullah Kopaei (Chairman of the Board of Directors of Engineers Consulting for Design and Research of Water and Wastewater)", Journal of Water and Wastewater; Ab va Fazilab (in persian), 7, 4, 1997, 58-61. doi: 10.22093/wwj.1997.173989

(1997). 'Interview with Mr. Engineer Abdullah Kopaei (Chairman of the Board of Directors of Engineers Consulting for Design and Research of Water and Wastewater)', Journal of Water and Wastewater; Ab va Fazilab (in persian), 7(4), pp. 58-61. doi: 10.22093/wwj.1997.173989

, "Interview with Mr. Engineer Abdullah Kopaei (Chairman of the Board of Directors of Engineers Consulting for Design and Research of Water and Wastewater)," Journal of Water and Wastewater; Ab va Fazilab (in persian), 7 4 (1997): 58-61, doi: 10.22093/wwj.1997.173989

Interview with Mr. Engineer Abdullah Kopaei (Chairman of the Board of Directors of Engineers Consulting for Design and Research of Water and Wastewater). Journal of Water and Wastewater; Ab va Fazilab (in persian), 1997; 7(4): 58-61. doi: 10.22093/wwj.1997.173989