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(Second ed.). Upper Saddle River, NJ: Pearson Education. p. 197. ISBN 978-0-13-238034-8. Weisstein, Eric W. "Iff." From MathWorld--A Wolfram Web Resource...

Logic (Second ed.). Upper Saddle River, NJ: Pearson Education. ISBN 978-0-13-238034-8. Russell, Bertrand (1948). Human Knowledge: Its Scope and Limits....