Heredia, R. (1978). Business planning (1st.). Noble.
Cita Chicago (17th ed.)Heredia, R. Business Planning. 1st. Bombay: Noble, 1978.
Cita MLA (9th ed.)Heredia, R. Business Planning. 1st. Noble, 1978.
Atenció: Aquestes cites poden no estar 100% correctes.