Heckman, C. W. (1979). Rice field ecology in the nort eastern Thailand: The effect of wet and dry seasons on a cultivated aquatic ecosystem. Dr W Junk bv Publishers.

Heckman, Charles W. Rice Field Ecology in the Nort Eastern Thailand: The Effect of Wet and Dry Seasons on a Cultivated Aquatic Ecosystem. Hauge: Dr W Junk bv Publishers, 1979.

Heckman, Charles W. Rice Field Ecology in the Nort Eastern Thailand: The Effect of Wet and Dry Seasons on a Cultivated Aquatic Ecosystem. Dr W Junk bv Publishers, 1979.