Manning, R. E., & Manning, M. S. (2013). Walking distance: Extraordinary hikes for ordinary people. Oregon State University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रManning, Robert E., और Martha S. Manning. Walking Distance: Extraordinary Hikes for Ordinary People. Corvalis: Oregon State University Press, 2013.
एमएलए (8वां संस्करण) प्रशस्ति पत्रManning, Robert E., और Martha S. Manning. Walking Distance: Extraordinary Hikes for Ordinary People. Oregon State University Press, 2013.
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