Heredia, R. (1978). Business planning (1st.). Noble.
Lua i Stíl Chicago (17ú heag.)Heredia, R. Business Planning. 1st. Bombay: Noble, 1978.
Lua MLA (9ú heag.)Heredia, R. Business Planning. 1st. Noble, 1978.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.