TY  - BOOK
AU  - HURLEY, P.J
TI  - A concise introduction to logic
UR  - https://www.pdfdrive.com/a-concise-introduction-to-logic-e94846641.html
UR  - https://www.pdfdrive.com/a-concise-introduction-to-logic-e190010843.html
UR  - https://www.pdfdrive.com/a-concise-introduction-to-logic-12th-edition-e175293462.html
UR  - https://www.pdfdrive.com/a-concise-introduction-to-logic-11th-ed-e19866879.html
UR  - https://www.pdfdrive.com/a-concise-introduction-to-logic-e39907266.html
ER  -