A First Course in Network Theory
Ernesto Estrada & Philip Knight
An Introduction to Complex Analysis in Several Variables
L. Hormander
Principles of Mathematics. Second Edition
Carl Barnett Allendoerfer & Carl Barnett Allendoerfer (and Oakley (cletus Odia)) & Cletus Odia Oakley
The Secret Sharer
Joseph Conrad
Abstract Riemann Integration
Barend Christiaan Strydom
Professor Stewart's Hoard of Mathematical Treasures
Ian Nicholas Stewart