Cita APA (7th ed.)

Schaufele, C., & Zumoff, N. (1995). Earth algebra: College algebra with applications to environmental issues. Harper College.

Cita Chicago (17th ed.)

Schaufele, Christopher, i Nancy Zumoff. Earth Algebra: College Algebra with Applications to Environmental Issues. New York: Harper College, 1995.

Cita MLA (9th ed.)

Schaufele, Christopher, i Nancy Zumoff. Earth Algebra: College Algebra with Applications to Environmental Issues. Harper College, 1995.