Since most of these references have been cited in the text, it may be not necessary!!!
For symmetric matrices, Cullum and Donath  propose what appears to be the first block Lanczos method. Golub and Underwood  also discuss the method. The first industrial implementation is in . Marques also releases the code BLIZPACK  that implements a block Lanczos code. The report by Baglama, Calvetti, Reichel, and Ruttan  considers an implicitly restarted Lanczos method.
For nonsymmetric matrices, Sadkane  discusses a block Arnoldi algorithm within a restarting method. The books by Chatelin  and Saad  also include material on block Arnoldi methods. Scott  provides software for a block Arnoldi method. Jia [243,245,] provides theoretical results and a restarting scheme.