Gaya APA

Leary, C, C., Kristiansen, L. (2015). A Friendly Introduction to Mathematical Logic A Friendly Introduction to Mathematical Logic (2nd Edition). United States of America: Milne Library Publishing.

Gaya MLA

Leary, Christopher, C.., Kristiansen, Lars. "A Friendly Introduction to Mathematical Logic A Friendly Introduction to Mathematical Logic". 2nd Edition United States of America: Milne Library Publishing, 2015. Text.