Kermit Jr., Paul (March 1989). "Design Features of The Helms Pumped Storage Project". IEEE Transactions on Energy Conversion. 4 (1). Institute of Electrical and Electronics Engineers: 24–25. Bibcode:1989ITEnC...4....9P. doi:10.1109/MPER.1989.4310531.
harvard.edu
ui.adsabs.harvard.edu
Kermit Jr., Paul (March 1989). "Design Features of The Helms Pumped Storage Project". IEEE Transactions on Energy Conversion. 4 (1). Institute of Electrical and Electronics Engineers: 24–25. Bibcode:1989ITEnC...4....9P. doi:10.1109/MPER.1989.4310531.
lmvp.org
The Dam Truth About Reservoirs "There are 2 broad categories of reservoirs, the valley reservoir [or on-river storage,] and the off-river storage reservoir"
nwcouncil.org
Yeung, Manho (17 October 2008). "Helms Pumped Storage Plant"(PDF). Pacific Gas and Electric Company. Archived from the original(PDF) on 2 January 2012. Retrieved 15 January 2012.
Yeung, Manho (17 October 2008). "Helms Pumped Storage Plant"(PDF). Pacific Gas and Electric Company. Archived from the original(PDF) on 2 January 2012. Retrieved 15 January 2012.