APA
SALT L. E., . (1961). Oxford Junior Encyclopaedia : Volume IV Communications. London: Oxford University Press.
Chicago
SALT L E, . 1961. Oxford Junior Encyclopaedia : Volume IV Communications. London: Oxford University Press.
Harvard
SALT L. E., . (1961). Oxford Junior Encyclopaedia : Volume IV Communications. London: Oxford University Press.
MLA
SALT L E, . Oxford Junior Encyclopaedia : Volume IV Communications. London: Oxford University Press. 1961.
