Columbia subject headings:
Heenan, Patrick, 1910-1942.
Singapore--History--Siege, 1942.
World War, 1939-1945--Campaigns--Singapore.
Harvard subject headings:
Heenan, Patrick, 1910-1942.
Singapore--History--Siege, 1942
World War, 1939-1945--Campaigns--Singapore.
Princeton subject headings:
Heenan, Patrick, 1910-1942.
Singapore--History--Seige, 1942.
World War, 1939-1945--Campaigns--Singapore.