Gill, R. R. R. (1990). Deducibility and decidability. Routledge.
Chicago-čujuhus (17. p.)Gill, R. R. Rockingham. Deducibility and Decidability. London ; New York: Routledge, 1990.
MLA-čujuhus (9. p.)Gill, R. R. Rockingham. Deducibility and Decidability. Routledge, 1990.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.