Heuck 1998, p. 351. Heuck, Susan (May–June 1998). "A Personal Sacrifice in the Interest of Science: Calvert, Schliemann, and the Troy Treasures". The Classical World: The World of Troy. 91 (5): 345–354. doi:10.2307/4352103. JSTOR4352103.
Heuck 1998, p. 351. Heuck, Susan (May–June 1998). "A Personal Sacrifice in the Interest of Science: Calvert, Schliemann, and the Troy Treasures". The Classical World: The World of Troy. 91 (5): 345–354. doi:10.2307/4352103. JSTOR4352103.
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Green, Flack Towers cites Foedrowitz 1998 Green, Walter G. "Flak Towers". Electronic Encyclopedia of Emergency defense and Civil Management. Archived from the original on 27 September 2013. Retrieved 25 September 2013. Foedrowitz, Michael (1998). The Flak Towers in Berlin, Hamburg and Vienna 1940-1950. Atglen, Pennsylvania: Schiffer Military/Aviation History.
WTM staff 2011, p. 5. WTM staff (February 2011). "The Mighty Flak Towers"(PDF). The War Tourist Magazine (4). www.wartourist.eu: 5. Archived from the original(PDF) on 2016-03-04. Retrieved 2012-01-14.
Green, Flack Towers cites Foedrowitz 1998 Green, Walter G. "Flak Towers". Electronic Encyclopedia of Emergency defense and Civil Management. Archived from the original on 27 September 2013. Retrieved 25 September 2013. Foedrowitz, Michael (1998). The Flak Towers in Berlin, Hamburg and Vienna 1940-1950. Atglen, Pennsylvania: Schiffer Military/Aviation History.
WTM staff 2011, p. 5. WTM staff (February 2011). "The Mighty Flak Towers"(PDF). The War Tourist Magazine (4). www.wartourist.eu: 5. Archived from the original(PDF) on 2016-03-04. Retrieved 2012-01-14.