Tham khảo U-15 (tàu ngầm Đức) (1936)

1 2 Kemp 1997, tr. 63
1 2 3 4 5 6 7 8 Helgason, Guðmundur. “The Type IIA U-boat U-15”. German U-boats of WWII - uboat.net. Truy cập ngày 7 tháng 3 năm 2024.
1 2 3 4 5 6 Gröner 1991, tr. 39–40.
1 2 Helgason, Guðmundur. “Ships hit by U-15”. German U-boats of WWII - uboat.net. Truy cập ngày 9 tháng 3 năm 2024.
↑ Rohwer 2005, tr. 2, 7-10, 14

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