APA
Salt L. E., Boumphrey G., . (1949). Oxford junior encyclopaedia: Natural history. Oxford: Oxford University Press.
Chicago
Salt Laura E, Boumphrey Geoffrey, . 1949. Oxford junior encyclopaedia: Natural history. Oxford: Oxford University Press.
Harvard
Salt L. E., Boumphrey G., . (1949). Oxford junior encyclopaedia: Natural history. Oxford: Oxford University Press.
MLA
Salt Laura E, Boumphrey Geoffrey, . Oxford junior encyclopaedia: Natural history. Oxford: Oxford University Press. 1949.