You should request world rights in all languages and editions. If some of your own writing in the manuscript has been previously published, either in journals or books, you may need permission or assignment of copyright from the earlier publisher, depending on the length and nature of the reprinted material. With regard to previously unpublished material, in general a small, noncontroversial quotation used without permission may be acceptable, whereas a substantial or controversial quotation requires permission from the author or the author's heirs, unless all rights have been yielded to another, such as an archive, in which case the archive is empowered to grant and must be approached for permission. Barring clear and unambiguous assignment of copyright, all copyrights belong to the author, whether or not the material in question has been published. These same general rules apply to quotation of interviews.
Illustrative materials present another type of problem.
Any payments required are essentially payments for services rendered, even though the forms stating the conditions under which publication may be made read much like copyright permissions. For additional information on copyrights and permissions, you may wish to consult The Chicago Manual of Style, 14th ed. The Press urges authors to write direct and clear English in a style that is accessible to the broadest possible audience for a given work. Please be sensitive to the social implications of language and seek wording that is free of discriminatory or sexist overtones. For some works the basic parenthetical reference style, with explanatory notes and works cited list, of Joseph Gibaldi's MLA Handbook for Writers of Research Papers, 5th ed.