Gill, R. R. R. (1990). Deducibility and decidability. Routledge.
芝加哥风格引文Gill, R. R. Rockingham. Deducibility and Decidability. London ; New York: Routledge, 1990.
MLA引文Gill, R. R. Rockingham. Deducibility and Decidability. Routledge, 1990.
警告：这些引文格式不一定是100％准确.