Helgoland (lớp thiết giáp hạm) (Vietnamese Wikipedia)

Analysis of information sources in references of the Wikipedia article "Helgoland (lớp thiết giáp hạm)" in Vietnamese language version.

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worldcat.org

Halpern 1995, tr. 196 Halpern, Paul G. (1995). A Naval History of World War I. Annapolis: Naval Institute Press. ISBN 1-55750-352-4. OCLC 57447525.
Halpern 1995, tr. 197 Halpern, Paul G. (1995). A Naval History of World War I. Annapolis: Naval Institute Press. ISBN 1-55750-352-4. OCLC 57447525.
Halpern 1995, tr. 197–198 Halpern, Paul G. (1995). A Naval History of World War I. Annapolis: Naval Institute Press. ISBN 1-55750-352-4. OCLC 57447525.