Asadulla, S. Thirty-nine perfect numbers and their divisors. Wiley.
Chicago Style (17th ed.) CitationAsadulla, Syed. Thirty-nine Perfect Numbers and Their Divisors. Wiley.
MLA (9th ed.) CitationAsadulla, Syed. Thirty-nine Perfect Numbers and Their Divisors. Wiley.
Warning: These citations may not always be 100% accurate.