APA
Parker T. a. H. W., . (1972). Text book of Zoology ; Vol.2 ; 7th ed. Vertebrates. Londan: Macmillan Press Ltd.
Chicago
Parker T.Jeffery and Haswell William, . 1972. Text book of Zoology ; Vol.2 ; 7th ed. Vertebrates. Londan: Macmillan Press Ltd.
Harvard
Parker T. a. H. W., . (1972). Text book of Zoology ; Vol.2 ; 7th ed. Vertebrates. Londan: Macmillan Press Ltd.
MLA
Parker T.Jeffery and Haswell William, . Text book of Zoology ; Vol.2 ; 7th ed. Vertebrates. Londan: Macmillan Press Ltd. 1972.