Acknowledgements

We are indebted, mainly for the reading selections, to many sources. We have put forth the fullest effort to trace each and every source, and their origins and our acknowledgements are indicated within the book. However, a small number of copyright materials remain uncredited because the original copyright holders could not be located, or we were unable to establish communication with them. It may be the case that some unintentional omissions have occurred in the employment of some copyright materials. We are grateful to these authors and sources, and we apologize for not being able to extend our acknowledgements in detail. For any questions concerning copyrights and permissions, please contact

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