United States Department of Agriculture. (1956). Water: The yearbook of agriculture 1955. The United States Government Printing Office.
Чикаго-гийн эшлэл (17 дахь хэвлэлт)United States Department of Agriculture. Water: The Yearbook of Agriculture 1955. Washington, D.C: The United States Government Printing Office, 1956.
MLA -ийн эшлэл (9 дэх хэвлэлт)United States Department of Agriculture. Water: The Yearbook of Agriculture 1955. The United States Government Printing Office, 1956.
Анхааруулга: Эдгээр ишлэлүүд үргэлж 100% үнэн зөв биш байж магадгүй.