Spencer, P. R., Fritschler, L. D., Dugger, E., & Houy, H. H. (1942). Exploring new trails. Lyons and Carnahan.
Lua i Stíl Chicago (17ú heag.)Spencer, Paul R., Lois Duffin Fritschler, Ethel Dugger, agus Henrietta H. Houy. Exploring New Trails. Chicago ; Dallas ; Los Angeles ; Atlanta ; New York: Lyons and Carnahan, 1942.
Lua MLA (8ú heag.)Spencer, Paul R., et al. Exploring New Trails. Lyons and Carnahan, 1942.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.