Dyfyniad APA

Kupchella, C. E., & Hyland, M. C. (1993). Environmental science: Living within the system of nature (3rd ed.). Prentice Hall.

Dyfyniad Arddull Chicago

Kupchella, Charles E., and Margaret C. Hyland. Environmental Science: Living Within the System of Nature. 3rd ed. Englewood Cliffs, N.J: Prentice Hall, 1993.

Dyfyniad MLA

Kupchella, Charles E., and Margaret C. Hyland. Environmental Science: Living Within the System of Nature. 3rd ed. Prentice Hall, 1993.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.