Callicott, J. B. (1987). Companion to A sand county almanac : interpretive & critical essays: Interpretive and critical essays. University of Wisconsin Press.
Cita Chicago (17th ed.)Callicott, J. Baird. Companion to A Sand County Almanac : Interpretive & Critical Essays: Interpretive and Critical Essays. Madison, WI: University of Wisconsin Press, 1987.
Cita MLA (9th ed.)Callicott, J. Baird. Companion to A Sand County Almanac : Interpretive & Critical Essays: Interpretive and Critical Essays. University of Wisconsin Press, 1987.
Atenció: Aquestes cites poden no estar 100% correctes.