Gaya APA

Easton, T, A., Rischer, C, E. (1992). Focus and human biology / Carl E. Rischer, Thomas A. Easton . New York: Harper Collins.

Gaya MLA

Easton, Thomas, A., Rischer, Carl, E.. "Focus and human biology / Carl E. Rischer, Thomas A. Easton". New York: Harper Collins, 1992. Textbook.