Lancaster, F. W. (1979). Information retrieval systems: Characteristics, testing and evaluation (2nd ed.). John Wiley & Sons.
Lua i Stíl Chicago (17ú heag.)Lancaster, F. Wilfrid. Information Retrieval Systems: Characteristics, Testing and Evaluation. 2nd ed. New York: John Wiley & Sons, 1979.
Lua MLA (9ú heag.)Lancaster, F. Wilfrid. Information Retrieval Systems: Characteristics, Testing and Evaluation. 2nd ed. John Wiley & Sons, 1979.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.