You missunderstood my example and my intention. My fault.
The footnote is one which refers to a paperbook
The reference style "[Hawking, 1975]" is the "Harvard Style". https://en.wikipedia.org/wiki/Harvard_style
It is just an abbreviation of the complete part in the bibliography.
Your example with "chapter 5, par. 23 ff." is exactly what I meant.
I've no strong opinions, if it's appropriate to mention the chapter.
May be a shorter "[Hawking, 1975] par. 1145 ff. is fine.
But back to the topic:
Do you recommend to number all paragraphs here and now?
Or is such referencing style so unusual, that only a very few readers know what that means?