Dyfyniad APA

Viesssman, W., & Welty, C. (1985). Water management: Technology and institutions. Harper.

Dyfyniad Arddull Chicago

Viesssman, Warren, and Clare Welty. Water Management: Technology and Institutions. Cambrdge: Harper, 1985.

Dyfyniad MLA

Viesssman, Warren, and Clare Welty. Water Management: Technology and Institutions. Harper, 1985.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.