✓

@book{book:1378501,
    title = {Introduction to Mathematical Logic, Sixth Edition},
    author = {Mendelson, Elliott},
    publisher = {CRC Press},
    isbn = {9781482237726,1482237725,978-1-4822-3778-8,1482237784},
    year = {2015},
    series = {Discrete Mathematics and Its Applications},
    edition = {6th ed},
    volume = {},
    url = {http://gen.lib.rus.ec/book/index.php?md5=b5d51b11a51440efad5af1d901d02c56},
    date-added = {2023-11-27 8:46:36 +0100}
}

@book{book:1378501, title = {Introduction to Mathematical Logic, Sixth Edition}, author = {Mendelson, Elliott}, publisher = {CRC Press}, isbn = {9781482237726,1482237725,978-1-4822-3778-8,1482237784}, year = {2015}, series = {Discrete Mathematics and Its Applications}, edition = {6th ed}, volume = {}, url = {http://gen.lib.rus.ec/book/index.php?md5=b5d51b11a51440efad5af1d901d02c56}, date-added = {2023-11-27 8:46:36 +0100} }