Book
Completion requirements
SET THEORY AND LOGIC
Author :Robert R. Stoll
https://staffnew.uny.ac.id/upload/132319832/pendidikan/ebooksclub.org__Set_Theory_and_Logic.pdf
1. Chapter 2
https://staffnew.uny.ac.id/upload/132319832/pendidikan/ebooksclub.org__Set_Theory_and_Logic.pdf