Dyfyniad APA

Wittgren, H. (1988). Removal of wastewater nitrogen in a wetland filter. Universitetet i Linköping.

Dyfyniad Arddull Chicago

Wittgren, Hans-Bertil. Removal of Wastewater Nitrogen in a Wetland Filter. Linköping, Sweden: Universitetet i Linköping, 1988.

Dyfyniad MLA

Wittgren, Hans-Bertil. Removal of Wastewater Nitrogen in a Wetland Filter. Universitetet i Linköping, 1988.

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