Edward B. Saff & Arthur David Snider (2003). "Chapter 2.1". Fundamentals of Complex Analysis. Prentice Hall. ISBN978-01-390-7874-3. Archived from the original on 2023-03-23. Retrieved 2015-11-15.
Dawikins, Paul. "Series and Sequences". Paul's Online Math Notes/Calc II (notes). Archived from the original on 30 November 2012. Retrieved 18 December 2012.
Edward B. Saff & Arthur David Snider (2003). "Chapter 2.1". Fundamentals of Complex Analysis. Prentice Hall. ISBN978-01-390-7874-3. Archived from the original on 2023-03-23. Retrieved 2015-11-15.
Dawikins, Paul. "Series and Sequences". Paul's Online Math Notes/Calc II (notes). Archived from the original on 30 November 2012. Retrieved 18 December 2012.