Nicholas Copernicus University. (2000). Logic and Logical Philosophy. Nicholas Copernicus University Press.
Citação do estilo Chicago (17ª ed.)Nicholas Copernicus University. Logic and Logical Philosophy. Torun, Polonia: Nicholas Copernicus University Press, 2000.
Citação MLA (8ª ed.)Nicholas Copernicus University. Logic and Logical Philosophy. Nicholas Copernicus University Press, 2000.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.