APA (7th ed.) Zitazioa
LANGFORD, I. (1991). CHILDHOOD LEUKAEMIA MORTALITY AND POPULATION CHANGE IN ENGLAND AND WALES 1969-73.
Chicago Style (17th ed.) Zitazioa
LANGFORD, I. CHILDHOOD LEUKAEMIA MORTALITY AND POPULATION CHANGE IN ENGLAND AND WALES 1969-73. 1991.
MLA (9th ed.) Zitazioa
LANGFORD, I. CHILDHOOD LEUKAEMIA MORTALITY AND POPULATION CHANGE IN ENGLAND AND WALES 1969-73. 1991.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.