Single on RCA Australia, also on the RCA Victor album of the same name.
Versatile Sydney soul/jazz/blues singer Renée Geyer (1953-2003) was active from the early 1970s, working in Australia and America. See, for example, her career outline at Howlspace [archived].
Double-sided hit in Adelaide with the B-side, Once In A Lifetime Thing.
Suggestion from Mike Robbins.
Single on King. Co-writer Betty Jean Newsome is not credited on the label but this omission was rectified following a legal ruling in 1967 (outlined here in an account of a later case).
The Originals page on It’s A Man’s Man’s Man’s World lists several other versions, including those by Big Maybelle (1966), Irma Thomas (It’s A Man’s Woman’s World, 1966), Tom Jones (1968).
See also Other cover versions, Sampling and Answer songs at the Wikipedia entry for the song.
The title echoes that of the (unconnected) 1963 film It’s A Mad, Mad, Mad, Mad World, according to The Originals.
An earlier recording from 1964, as It’s A Man’s World, was unreleased until 1985 on The CD Of JB (Sex Machine And Other Soul Classics). The liner notes: What we have here … is a previously unknown recording of the song from two years earlier, unearthed by a diligent engineer during the preparation of this CD.