Frederick, H. V. Dear Pen Pal. Simon & Schuster Books For Young Readers.
Lua i Stíl Chicago (17ú heag.)Frederick, Heather Vogel. Dear Pen Pal. Simon & Schuster Books For Young Readers.
Lua MLA (8ú heag.)Frederick, Heather Vogel. Dear Pen Pal. Simon & Schuster Books For Young Readers.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.