UNICEF. (1990). Water quality assessment in terai tubewell project.
Cita Chicago (17th ed.)UNICEF. Water Quality Assessment in Terai Tubewell Project. 1990.
Cita MLA (8th ed.)UNICEF. Water Quality Assessment in Terai Tubewell Project. 1990.
Atenció: Aquestes cites poden no estar 100% correctes.