Trapkus, C., Troester, R. R., & Quilty, C. (1989). Oral history interview with Charles Trapkus.
Lua i Stíl Chicago (17ú heag.)Trapkus, Chuck, Rosalie Riegle Troester, agus Charles Quilty. Oral History Interview with Charles Trapkus. 1989.
Lua MLA (8ú heag.)Trapkus, Chuck, et al. Oral History Interview with Charles Trapkus. 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.