Dyfyniad APA

Bellows, B. C. Soil management: National organic program regulation.

Dyfyniad Arddull Chicago

Bellows, Barbara C. Soil Management: National Organic Program Regulation.

Dyfyniad MLA

Bellows, Barbara C. Soil Management: National Organic Program Regulation.

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