• Scott Numbers are from: 2013 Scott Specialized Catalogue of United States stamps and covers of the world. Scott Publishing Co. Sidney, OH: 1016-1017.
  • Yacano, Bob and Angela. 2011. Postal History of the Philippine Republic, 1897-1901 Philatelic Monograph, self-published. 41-88.
  • Arnold   H.    Warren.    1941.   Unpublished    Studies    on    Philippine    Revenues.    Chapter   7 ( last accessed July 19, 2013)
  • Lehmann, Douglas K. 2006, The Tax System of Aguinaldo’s Revolutionary Government.
  • Philippine Philatelic Journal. Vol. 28, No.4: 24-32.
  • Lagerloef, Col. Hans. 1943. “Unusual Aguinaldos in One of the Most Theatrical and Interesting Interludes in the History of the Philippine Islands.” The Stamp Specialist Green Book ed. H.L. Lindquist. p. 51-64
  • Hurt, E. F. “Philippine Partisan Posts”. The American Philatelist. Vol. 61 No. 8-9, 1948.