Inversin, A. R. (1979). Hydraulic ram pump for tropical climates. Volunteers in Technical Assistance.
Chicago-viite (17. p.)Inversin, Allen R. Hydraulic Ram Pump for Tropical Climates. [Mt. Rainier, Md.]: Volunteers in Technical Assistance, 1979.
MLA-viite (8. p.)Inversin, Allen R. Hydraulic Ram Pump for Tropical Climates. Volunteers in Technical Assistance, 1979.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.