Middendorf III, G.A.; Sherbrooke, W.C.; Braun, E.J. (2001). “Comparison of Blood Squirted from the Circumorbital Sinus and Systemic Blood in a Horned Lizard, Phrynosoma cornutum”. 《The Southwestern Naturalist》 46 (3): 384–387. doi:10.2307/3672440. JSTOR3672440.
Sherbrooke, W. C. & Middendorf III, G. A. (2001). Blood-squirting variability in horned lizards (Phrynosoma). Copeia, 2001(4), 1114–1122. https://doi.org/10.1643/0045-8511(2001)001[1114:bsvihl]2.0.co;2
Middendorf III, G.A.; Sherbrooke, W.C.; Braun, E.J. (2001). “Comparison of Blood Squirted from the Circumorbital Sinus and Systemic Blood in a Horned Lizard, Phrynosoma cornutum”. 《The Southwestern Naturalist》 46 (3): 384–387. doi:10.2307/3672440. JSTOR3672440.