APA

Bayer F. M., Owre H. B., . (19671968). The free-living lower invertebrates. New York: Macmillan.

Chicago

Bayer Frederick M, Owre Harding B, . 19671968. The free-living lower invertebrates. New York: Macmillan.

Harvard

Bayer F. M., Owre H. B., . (19671968). The free-living lower invertebrates. New York: Macmillan.

MLA

Bayer Frederick M, Owre Harding B, . The free-living lower invertebrates. New York: Macmillan. 19671968.