Elementary Linear Algebra: Applications Version, 11th Edition (http://bcs.wiley.com/he-bcs/Books?action=index&itemId=1118434412&bcsId=8466)
Matrix DIagonalization Calculator(https://www.symbolab.com/solver/matrix-diagonalization-calculator)
Differential Equations and Linear Algebra, 6.1: Eigenvalues and Eigenvectors(https://www.mathworks.com/videos/differential-equations-and-linear-algebra-61-eigenvalues-and-eigenvectors-117469.html)