APA-čujuhus (7. p.)
Stumm, E. C. (1954). Lower middle devonian Phacopid Trilobites from Michigan, southwestern Ontario, and the Ohio Valley.
Chicago-čujuhus (17. p.)
Stumm, Erwin Charles. Lower Middle Devonian Phacopid Trilobites from Michigan, Southwestern Ontario, and the Ohio Valley. Ann Arbor, 1954.
MLA-čujuhus (9. p.)
Stumm, Erwin Charles. Lower Middle Devonian Phacopid Trilobites from Michigan, Southwestern Ontario, and the Ohio Valley. 1954.
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