References:
 
  1. Applied finite element analysis.
     Larry H. Segerlind.

  2. Introduction to finite elements in engineering.
     Tirupathi R. Chandrupatla. 
     Ashok D. Belegundu. 

  3. Introduction to the finite element method.
     Theory, Programming, and Applications
     Erik G. Thompson

  4. Conduction heat transfer.
     Vedat S. Arpaci.

  5. An introduction to finite element method.
     Reddy