Winner, W., Berg, V. S., & Langston-Unkefer, P. J. (1989). The use of stable sulfur and nitrogen isotopes in studies of plant responses to air pollution. In Stable Isotopes in Ecological Research (pp. 454–470). New York: Springer-Verlag.

Winner, William, V. S. Berg, and P. J. Langston-Unkefer. “The use of stable sulfur and nitrogen isotopes in studies of plant responses to air pollution.” In Stable Isotopes in Ecological Research, 454–70. New York: Springer-Verlag, 1989.

Winner W, Berg VS, Langston-Unkefer PJ. The use of stable sulfur and nitrogen isotopes in studies of plant responses to air pollution. In: Stable Isotopes in Ecological Research. New York: Springer-Verlag; 1989. p. 454–70.

Winner, William, et al. “The use of stable sulfur and nitrogen isotopes in studies of plant responses to air pollution.” Stable Isotopes in Ecological Research, Springer-Verlag, 1989, pp. 454–70.

Winner W, Berg VS, Langston-Unkefer PJ. The use of stable sulfur and nitrogen isotopes in studies of plant responses to air pollution. Stable Isotopes in Ecological Research. New York: Springer-Verlag; 1989. p. 454–470.