I suspect the book that was rescued (or left in the cat tank?) wasn't primarily about those variants.
The
book promised to make the reader into a
professional golf player, which would be atypical for any variants other than "
standard" and
minigolf, I guess, and to do so
within 30 days, which suggests that it must refer to some version so apocryphal that we have not even thought of it yet.
(Maybe its author invented one of his own and in order to qualify as a "professional", all you'll have to do is to send him a "where do I
find that 'professional league' you're talking about!?" letter so that he can enter your name on his sucker list?
)
On a marginally more serious note, the golfer displayed on the title seems to be wearing rather "traditional" clothing. No glove or cap, though, and the club he's holding would be a putter (if not a minigolf one) ...