Dyfyniad APA

Sopper, W. E. (1993). Municipal sludge use in land reclamation. Lewis Publishers.

Dyfyniad Arddull Chicago

Sopper, William E. Municipal Sludge Use in Land Reclamation. Boca Raton: Lewis Publishers, 1993.

Dyfyniad MLA

Sopper, William E. Municipal Sludge Use in Land Reclamation. Lewis Publishers, 1993.

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