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As each of the shells has achieved prominence, so a definitive book has been published that describes them. These books are not necessarily the most readable ones on the subject, but they are the most authoritative (because at the very least they were co-written by the developer of the shell).
For the Bourne shell, the book is The UNIX System V Environment (S. R. Bourne; Addison-Wesley, 1987). This book covers the Bourne shell programming language and provides an introduction to the other software tools which are used in conjunction with it.
For the Korn shell, the book is The Korn Shell command and programming language (Morris I. Bolsky and David G. Korn; Prentice-Hall, 1989). This is the standard reference to the Korn shell, and contains a tutorial and detailed description of the programming language supported by the shell.
Another useful book on the Korn shell is Learning the Korn Shell (Bill Rosenblatt; O'Reilly & Associates, Inc., 1993).