R. A.; Loest. Ammonia Volatilization and Absorption by Terrestrial Gastropods_ a Comparison between Shelled and Shell-Less Species (англ.) // Physiological Zoology : journal. — The University of Chicago Press, 1979. — Vol. 52, no. 4. — P. 461—469. — doi:10.2307/30155937. — JSTOR30155937.
R. A.; Loest. Ammonia Volatilization and Absorption by Terrestrial Gastropods_ a Comparison between Shelled and Shell-Less Species (англ.) // Physiological Zoology : journal. — The University of Chicago Press, 1979. — Vol. 52, no. 4. — P. 461—469. — doi:10.2307/30155937. — JSTOR30155937.