Spies I knew,

By McKenna, Marthe (Cnokaert),. London, Jarrolds, limited, 1933 . 287 p. 23 cm..

Circle of fear :

By Sumaida, Hussein.. Washington, [D.C.] : Brassey's, 1994 . xv, 304 p. : , Originally published: Toronto : Stoddart Pub. Co., 1991. | Includes index. 24 cm.. 0028810996

Place Hold on Circle of fear :

Wazir Agha Library, UOS Search for 'su:Secret service'

Spies I knew,

Circle of fear :