Dear Ms. Mala A.
Thanks for your mail. As I understand, as an author while writing, the matter should be YOUR OWN ORIGINAL CONTRIBUTION. In case you refer to any earlier work or works they should be adequately mentioned either as reference or as footnotes. verbatim citation of any sentence should be referred with " " marks. In case you want to use any charts or tables published by others, YOU MUST OBTAIN PRIOR WRITTEN PERMISSION from the original author (or from the principal/corresponding author in case it is a multiple author contribution)or the copy right holder. In fact, for using any reference or data, the source should be properly acknowledged AND you have the legal permission of the copyright holders. In case you wish to include some of your own articles published earlier, it is always advisable to seek permission of the publisher of the articles.
Once your manuscript is complete and ready and you have a publisher to print and publish your manuscript as a book, ask them about the legalities about the materials used in your proposed book. It is always advisable to keep such things in writing. They are supposed to know such things far better than you. Now if you relinquish the copyright of the book, you have to complete the formalities by signing into transfer of copyright form. If you want to retain the copyright to yourself, you have to act accordingly. Always keep the Royalty & Copyright issues in black & white if you understand that the book is quite salable.
These are the basic issues in a nutshell. However, in case you are planning to write and publish a book consult with some publisher you know personally and seek their advise.