APA Citation

Gaylard Simpson, G., & Beck, W. (1969). Life an introduction to biology. New York (EUA):.

Chicago Style Citation

Gaylard Simpson, G., and W.S Beck. Life an Introduction to Biology. New York (EUA):, 1969.

MLA Citation

Gaylard Simpson, G., and W.S Beck. Life an Introduction to Biology. New York (EUA):, 1969.

Warning: These citations may not always be 100% accurate.