This is all detailed in Thy Kingdom Come (1890), Volume 3 of Millennial Dawn, later retitled Studies in the Scriptures, s. 305–308.
The Finished Mystery from Google Book Search. Published in 1917 by the Watchtower Society. It was considered to be volume 7 of Studies in the Scriptures. Later editions read differently.
Kenneth L. Woodard: Apocalypse Later. Jehovah's Witnesses decide the end is fluid. Newsweek, 1995, nro 18.12.1995, s. s.59, Religion section. Artikkelin verkkoversio.