SM U-28 (Germany) (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "SM U-28 (Germany)" in English language version.

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books.google.com

Hearst Magazines (September 1934). "Popular Mechanics". Popular Mechanics. Hearst Magazines: 398–401, 118A. ISSN 0032-4558.^{[permanent dead link]}

Helgason, Guðmundur. "WWI U-boat commanders: Freiherr Georg-Günther von Forstner (Friedrich-August Cross (Oldenburg))". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 22 December 2014.
Helgason, Guðmundur. "WWI U-boat commanders: Otto Rohrbeck". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 22 December 2014.
Helgason, Guðmundur. "WWI U-boat commanders: Freiherr von Loë-Degenhart". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 22 December 2014.
Helgason, Guðmundur. "WWI U-boat commanders: Georg Schmidt". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 22 December 2014.
Helgason, Guðmundur. "WWI U-boats: U 28". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net.
Helgason, Guðmundur. "Ships hit by U 28". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 22 December 2014.

Hearst Magazines (September 1934). "Popular Mechanics". Popular Mechanics. Hearst Magazines: 398–401, 118A. ISSN 0032-4558.^{[permanent dead link]}