Note: Some books are on the restricted book shelf!
Recommended are
Complex Analysis, J M Howie (Springer 2003). Library Ref.
515.24 HOW
Murray R. Spiegel: Theory and problems of complex
variables. (510.76 Spi).
Donald W. Trim: Introduction to Complex analysis and its applications.
(515.24 Tri).
Advanced Engineering Mathematics, 8th ed.
E. Kreyszig (Wiley 1999). Library Ref. 510.245 KRE