Wright 2002, Tank: The Progress of a Monstrous War Machine, p. 48, "To the extent that they communicated at all, the tank crews did so by squeezing carrier pigeons out through a hole in a gun sponson, by brandishing a shovel through the manhole, or by frantic coloured discs in the air." Wright, Patrick (2002), Tank: The Progress of a Monstrous War Machine, Viking, ISBN978-0-670-03070-5
Wickert, Matthias (January 2007), "Electric armour Against Shaped Charges: Analysis of Jet Distortion With Respect to Jet Dynamics and Current Flow", IEEE Transactions on Magnetics, 43 (1), IEEE: 426–29, Bibcode:2007ITM....43..426W, doi:10.1109/TMAG.2006.887650, S2CID12106623
Wickert, Matthias (January 2007), "Electric armour Against Shaped Charges: Analysis of Jet Distortion With Respect to Jet Dynamics and Current Flow", IEEE Transactions on Magnetics, 43 (1), IEEE: 426–29, Bibcode:2007ITM....43..426W, doi:10.1109/TMAG.2006.887650, S2CID12106623
hathitrust.org
babel.hathitrust.org
Wells, H.G. (1903). "The Land Ironclads". The Strand Magazine. 23 (156): 751–69.
Slyusar, Vadym (2018). "Methodology of identification of the critical requirements for armaments and military equipment". VI International Scientific and Practical Conference "Coordination problems of military technical and devensive industrial policy in Ukraine. Weapons and military equipment development perspectives". Abstracts of reports. – October 10–11, 2018. – Kyiv. – DOI: 10.13140/RG.2.2.36335.69281.
Wickert, Matthias (January 2007), "Electric armour Against Shaped Charges: Analysis of Jet Distortion With Respect to Jet Dynamics and Current Flow", IEEE Transactions on Magnetics, 43 (1), IEEE: 426–29, Bibcode:2007ITM....43..426W, doi:10.1109/TMAG.2006.887650, S2CID12106623