Shapiro, Helen (Winter 1991). "Determinants of Firm Entry into the Brazilian Automobile Manufacturing Industry, 1956–1968". The Business History Review. 65 (4, The Automobile Industry): 879. doi:10.2307/3117267. JSTOR3117267. S2CID153363903.
Shapiro, Helen (Winter 1991). "Determinants of Firm Entry into the Brazilian Automobile Manufacturing Industry, 1956–1968". The Business History Review. 65 (4, The Automobile Industry): 879. doi:10.2307/3117267. JSTOR3117267. S2CID153363903.
Shapiro, Helen (Winter 1991). "Determinants of Firm Entry into the Brazilian Automobile Manufacturing Industry, 1956–1968". The Business History Review. 65 (4, The Automobile Industry): 879. doi:10.2307/3117267. JSTOR3117267. S2CID153363903.
"The Year's cars". Automobile Year (1953–54 ed.). Lausanne: Edita S.A.: 37 1953. ISSN0084-7674. OCLC1230860432.
"Étude technique et pratique Velam Isetta". Revue Technique Automobile (in French) (119). Paris: Régie Automobile Industrie Publicité.: 163 March 1956. ISSN0017-307X. OCLC647972462.
"65 MPH and 80 MPG-That's the Messerschmitt". Motorcycle Mechanics. London: Mercury House Consumer Publications: 34–35. April 1963. ISSN0262-5822. OCLC215410417. This bubble-car has a beetle-like outline
Seehusen, Manfred; Schwietzer, Andy (2004). Isetta: Ein Auto bewegt die Welt [Isetta: A Car Moves the World] (in German). Wallmoden: Bodensteiner Verlag. p. [page needed]. ISBN978-3-9806631-2-0. OCLC61429885.