Παραπομπή APA

Early erosion control practices in Virginia. United States of America: Department of Agriculture.

Παραπομπή Chicago Style

Early Erosion Control Practices in Virginia. United States of America: Department of Agriculture.

Παραπομπή MLA

Early Erosion Control Practices in Virginia. United States of America: Department of Agriculture.

Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.