APA
P.R. Twentyman, . (1989). British Journal of Cancer. U.S.A: Macmillan Press Ltd.
Chicago
P.R. Twentyman, . 1989. British Journal of Cancer. U.S.A: Macmillan Press Ltd.
Harvard
P.R. Twentyman, . (1989). British Journal of Cancer. U.S.A: Macmillan Press Ltd.
MLA
P.R. Twentyman, . British Journal of Cancer. U.S.A: Macmillan Press Ltd. 1989.