All ships of the A class:

Royal Norwegian Navy (more on Royal Norwegian Navy)

HNoMS A-2
HNoMS A-3 (lost 15 Apr 1940)
HNoMS A-4 (lost 15 Apr 1940)

2 Submariness of the A class lost.

Books dealing with this subject include:

Abandon Ship!, Newcomb, Richard F., 2000
Above Us the Waves, Warren, C.E.T. and Benson, James, 1971 (transl.)
Advance Force - Pearl Harbor, Burlingame, Burl, 2002
Aircraft Versus Submarine, Price, Alfred, 1980 (transl.)
Allied Submarine Attacks of World War Two, Rohwer, Jürgen, 1997
Allied Submarines, Watts, Anthony J., 1977
Allied Submarines of World War Two, Poolman, Kenneth, 1990 (transl.)
American Submarine War Patrol Reports: U.S.S. Wahoo (SS-238), McDaniel, J.T. (editor), 2003
American Submarines, Lenton, H.T., 1973
Assault on a Queen, Finney, Jack, 1959
Axis Submarines, Watts, Anthony J., 1977
Bacalao, McDaniel, J.T., 2004
Back from the Deep, LaVO, Carl, 1998
Baltic Assignment, Wilson, Michael, 1985
Battle of the Atlantic, Nesbit, Roy C., 2002