Columbia subject headings:
Great Britain. MI5--History.
Intelligence officers--Great Britain--Biography.
Intelligence service--Great Britain--History--20th century.
Wright, Peter.
Harvard subject headings:
Espionage--History--20th century.
Great Britain. MI5--History.
Intelligence officers--Great Britain--Biography.
Wright, Peter, 1916-
Wright, Peter, 1916-1995.
Princeton subject headings:
Great Britain. MI5--History.
Intelligence officers--Great Britain--Biography.
Intelligence service--Great Britain--History--20th century.
Wright, Peter, 1916-1995.