Pietro Tacchini, Hector MacPherson, Jr., Popular Astronomy, vol. 13 (1905), pp.306-308. The Janssen Medal award is mentioned on page 308.
General Notes, Popular Astronomy, Vol. 25, 1917, p.214-216. The Janssen Medal is mentioned on page 215, along with a note about two silver medals awarded to Fabry's colleagues at the Marseilles Observatory, Henri Buisson and Henry Bourget.
General Notes, Publications of the Astronomical Society of the Pacific, Vol. 33, No. 192, pp.120-122 (1921). The reference to the Janssen Medal is on page 122.
General Notes, Publications of the Astronomical Society of the Pacific, Vol. 36, No. 214, pp.360-363 (1924). The reference to the Janssen Medal is on page 362.
William Hammond Wright, 1871-1959, Paul W. Merril, Publications of the Astronomical Society of the Pacific, Vol. 71 (1959), No. 421, p.305
Prizes of the French Academy, Ralph E. Wilson, General Notes, Popular Astronomy, Vol. 21, 1913, pp.383-385. This gives all the Janssen Medal awards between 1887 and 1912 that were known to US astronomer Ralph E. Wilson (1886-1960) the author of the note.
Charles Augustus Young, John M. Poor, Popular Astronomy, vol. 16 (1908), pp.218-230. The Janssen Medal award is mentioned on page 229.
Huggins, Sir William (1824–1910), Barbara J. Becker, Oxford Dictionary of National Biography, Oxford University Press, 2004; online edn, Jan 2008, accessed 23 Jan 2011