Budbill, D. (1979). Snowshoe trek to otter river. Bantam Skylark.
Cita Chicago (17th ed.)Budbill, David. Snowshoe Trek to Otter River. New York: Bantam Skylark, 1979.
Cita MLA (9th ed.)Budbill, David. Snowshoe Trek to Otter River. Bantam Skylark, 1979.
Atenció: Aquestes cites poden no estar 100% correctes.