Gaya APA
Blockwelder, R, E. (1972).
Guide to the Taxonomic Literatur of Vertebrates .
Ames:
the lowa state university press.
Gaya MLA
Blockwelder, Richard, E..
"Guide to the Taxonomic Literatur of Vertebrates".
Ames:
the lowa state university press,
1972.
Text.