Beth, E. W. (1962). Formal methods: An introduction to symbolic logic and to the study of effective operations in arithmetic and logic. D. Reidel.
Chicago-viite (17. p.)Beth, Evert Willem. Formal Methods: An Introduction to Symbolic Logic and to the Study of Effective Operations in Arithmetic and Logic. Dordrecht: D. Reidel, 1962.
MLA-viite (9. p.)Beth, Evert Willem. Formal Methods: An Introduction to Symbolic Logic and to the Study of Effective Operations in Arithmetic and Logic. D. Reidel, 1962.
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