APA

Pritchard P. C. H., . (1977). Three, two, one tortoise. : .

Chicago

Pritchard Peter C H, . 1977. Three, two, one tortoise. : .

Harvard

Pritchard P. C. H., . (1977). Three, two, one tortoise. : .

MLA

Pritchard Peter C H, . Three, two, one tortoise. : . 1977.