(1935). February conference, Soil Conservation Service and E.C.W. engineers. Oklahoma City, Oklahoma. Volume 2, Papers.
Chicago-viite (17. p.)February Conference, Soil Conservation Service and E.C.W. Engineers. Oklahoma City, Oklahoma. Volume 2, Papers. 1935.
MLA-viite (9. p.)February Conference, Soil Conservation Service and E.C.W. Engineers. Oklahoma City, Oklahoma. Volume 2, Papers. 1935.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.