O'Connell, Paul C., The Vatican Post Office, Vatican Notes, Volume 1, No. 7, page 5
Phinney, Rev. H. A., Cancellation Research Project, Vatican Notes, Volume X, No. 3, pages 7-8
Phinney, Rev. H. A., The Number In The Moon (Part 1), Vatican Notes, September 1963, Volume XII, No. 2, pages 7
Phinney, Rev. H. A., The Number In The Moon (Part 2), Vatican Notes, Nov/Dec 1963, Volume XII, No. 3, page 7
Phinney, Rev. H. A., The Number In The Moon (Part 3), Vatican Notes, March/April 1964, Volume XII, No. 5, page 10
Phinney, Rev. H. A., Vatican City First Day Cancellations, Vatican Notes, Volume XVI, No. 5, pages 5-10
Pirozzo,Greg, Analysis of a Vatican Cover Archive, Vatican Notes, Volume 58, No. 343, pages 10-11
Rundqvist, Neils, A Philatelic Day In Rome and Everyday Vatican Holy Year Cancellations, Vatican Notes,Sept/Oct 1975, Volume XXIV, No. 2, pages 4-5
Sieben, Stephen J., The Postal Markings Of The Vatican City State (Part 1), Vatican Notes, Volume XIII, No. 3, pages 3-4
Sieben, Stephen J., The Postal Markings Of The Vatican City State (Part 2), Vatican Notes, Volume XIII, No. 4, pages 11-12
Sieben, Stephen J., The Postal Markings Of The Vatican City State (Part 3), Vatican Notes, Volume XIII, No. 5, pages 5-62
Simpson, O.J., Postal Markings Of Vatican City, Vatican Notes, Volume IX, No. 3, pages 5-8