Hello Nuwan,
one of following should be fine:
CCNP BSCI Official Exam Certification Guide, 4th Edition
# ISBN-10: 1-58720-147-X
# ISBN-13: 978-1-58720-147-9
Building Scalable Cisco Internetworks (BSCI) (Authorized Self-Study Guide), 3rd Edition
# Book
# ISBN-10: 1-58705-223-7
# ISBN-13: 978-1-58705-223-1
see
http://www.ciscopress.com/bookstore/product.asp?isbn=1587052237
Hope to help
Giuseppe