Washington Trails Association. (1989). 25 centennial trails. Washington Trails Association.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWashington Trails Association. 25 Centennial Trails. Seattle, WA: Washington Trails Association, 1989.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWashington Trails Association. 25 Centennial Trails. Washington Trails Association, 1989.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.