Comfort, M. H. (1967). Danger on the trail: (Original title: Prairie schooners west). Scholastic Book Services.
Lua i Stíl Chicago (17ú heag.)Comfort, Mildred Houghton. Danger on the Trail: (Original Title: Prairie Schooners West). New York: Scholastic Book Services, 1967.
Lua MLA (9ú heag.)Comfort, Mildred Houghton. Danger on the Trail: (Original Title: Prairie Schooners West). Scholastic Book Services, 1967.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.