Ryan, M. (1993). Prentice Hall advanced mathematics: A precalculus approach. Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Ryan, Merilyn. Prentice Hall Advanced Mathematics: A Precalculus Approach. Englewood Cliffs, N. J: Prentice Hall, 1993.
Lua MLA (9ú heag.)Ryan, Merilyn. Prentice Hall Advanced Mathematics: A Precalculus Approach. Prentice Hall, 1993.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.