You can find the Kopp and Sayre method from the original paper, but you can also find it in this book,

Design of Process Equipment (Hardcover) by Kanti Mahajan

Hardcover: 346 pages
Publisher: Pressure Vessel Handbook Pub; 3 edition (June 1, 1992)
Language: English
ISBN-10: 0914458159
ISBN-13: 978-0914458159
Product Dimensions: 9.1 x 5.9 x 1.2 inches

http://www.amazon.com/Design-Process-Equ...63946150&sr=1-1