(Chicago Manual of Style 14.159-14.163)
Author, Title (Place of publication: Publisher, Year of publication), Format, Page number or Other identifying information.
1. Mimi Chan, All the King’s Women (Hong Kong: Hong Kong University Press, 2000), PDF e-book, chap. 4.
2. Chan, All the King’s Women, chap. 4.
Author. Title. Place of publication: Publisher, Year of publication. Format.
Chan, Mimi. All the King’s Women. Hong Kong: Hong Kong University Press, 2000. PDF e-book.
Page numbers are not always the same in electronic formats, so you can use chapter or section as a locator.
Include what format was used such as PDF e-book, Kindle edition, Microsoft Reader e-book, etc.