Citation, Documentation of Sources

Q. We are producing our first e-publication. If we were printing the book, the notes would have gone at the end of the publication, but technology is dictating that we divide up the notes and place them at the end of each section. If a work is first cited in the chapter 1 notes and then pops up again in chapter 4, can I use a shortened citation in the chapter 4 notes or must I repeat the information in full?

A. The technology doesn’t change the answer: whether a book is printed or electronic, if there is a bibliography, there’s no need for full citations. If there is no bibliography, it’s preferable to cite in full the first time a source appears in each chapter, although it’s common to cite in full only the first time a work appears in the book.

[This answer relies on the 17th edition of CMOS (2017) unless otherwise noted.]