| AUTHOR: | Garey, Michael R. |
| TITLE: | Computers and intractability : a guide to the theory of NP-completeness / Michael R. Garey, David S. Johnson. |
| PUBLISHER: | San Francisco : W. H. Freeman, c1979. |
| SERIES: | A Series of books in the mathematical sciences |
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| AUTHOR: | Sipser, Michael. |
| TITLE: | Introduction to the theory of computation / Michael Sipser. |
| PUBLISHER: | Boston : PWS Pub. Co., c1997. |
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