We are mixing fishes with clone-bones in this thread.

Public Domain - copyright - were major battles for Kippling & Sam Clemmons who found their novels quickly reprinted and "Napsterized" by China. They fought for international copyright laws - note older 1900 books with multiple locations of copyright.

Regarding Publishing STYLE

The rules for citations and NUMBERS varies by the intended publisher and audience. For example:

Journalism = Associated Press Stylebook = APS = primary style and usage guide for most newspapers:
http://www.apstylebook.com/

Social Science = American Psychological Association = APA = probably 90% of all U.S. academic research falls into this style.
http://apastyle.apa.org/

English/Lit = Modern Langauge Association = MLA = a snooty bunch of snotty nosed English teachers (that will quibble over "the Cambridge comma)
http://www.mla.org/style

Sincerely,
Gargoyle