Patterson, Richard Sharpe; Dougall, Richardson (1978) [1976 i.e. 1978]. The Eagle and the Shield: A History of the Great Seal of the United States. Department and Foreign Service series ; 161 Department of State publication ; 8900. Washington : Office of the Historian, Bureau of Public Affairs, Dept. of State : for sale by the Supt. of Docs., U.S. Govt. Print. Off. p. 448. LCCN78602518. OCLC4268298.
Hodgins, George Sherwood (1918), "National Flags of the United States", The Journal of American History, 12 (2), National Historical Society: 293–294 The "same effect" is presumably in reference to the 1902 president's flag, which omitted the ring of clouds above the eagle and had a "starburst" of only yellow rays instead. The white clouds of the full-color president's flag on the white background would give a similar effect.
Todd, Frank Morton; Panama-Pacific International Exposition Company (1921). The Story of the Exposition. Pub. for the Panama-Pacific international exposition company by G.P. Putnam's sons.
The Eagle and the Shield, p. 460-461. The notes on page 460 say the Army Institute of Heraldry has photos of these flags, apparently from both occasions.
Patterson, Richard Sharpe; Dougall, Richardson (1978) [1976 i.e. 1978]. The Eagle and the Shield: A History of the Great Seal of the United States. Department and Foreign Service series ; 161 Department of State publication ; 8900. Washington : Office of the Historian, Bureau of Public Affairs, Dept. of State : for sale by the Supt. of Docs., U.S. Govt. Print. Off. p. 448. LCCN78602518. OCLC4268298.
navy.mil
navair.navy.mil
United States Navy (August 1986). "NTP13(B): Flags, Pennants, & Customs". The sizes for shipboard use are in section 905, and boats/autos in section 1101 (precise dimensions for both in Annex D, page D-9). Onshore sizes specified in section 1504 (depends on if the flagpole is taller than 35 feet or not), and the aircraft plates are in section 1402. The tassel information is in section 1723, while the vice president's flag itself (along with its fringe size) is in section 1802. Notes on the manner of displaying are in section 901.
nytimes.com
"Flag for Vice President", The New York Times, March 16, 1915 This article also describes the upcoming flag as having a "blue bird", which was incorrect, as it was the full-color version of the president's flag which was used. It is possible the author thought the 1902 president's flag, with the white eagle, was being reversed—that would have required a blue eagle on a white background (which was indeed the basic design of the later 1936 vice president's flag).
Patterson, Richard Sharpe; Dougall, Richardson (1978) [1976 i.e. 1978]. The Eagle and the Shield: A History of the Great Seal of the United States. Department and Foreign Service series ; 161 Department of State publication ; 8900. Washington : Office of the Historian, Bureau of Public Affairs, Dept. of State : for sale by the Supt. of Docs., U.S. Govt. Print. Off. p. 448. LCCN78602518. OCLC4268298.