Tugwell, F. (1975). The politics of oil in Venezuela. Stanford University.
Chicago-čujuhus (17. p.)Tugwell, Franklin. The Politics of Oil in Venezuela. Stanford: Stanford University, 1975.
MLA-čujuhus (9. p.)Tugwell, Franklin. The Politics of Oil in Venezuela. Stanford University, 1975.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.