Cita APA (7th ed.)
Douglas, J. S. (1979). Advanced Guide to Hidroponics Soilless Cultivation. Pelham Books.
Cita Chicago (17th ed.)
Douglas, James Sholto. Advanced Guide to Hidroponics Soilless Cultivation. Londres, Inglaterra: Pelham Books, 1979.
Cita MLA (9th ed.)
Douglas, James Sholto. Advanced Guide to Hidroponics Soilless Cultivation. Pelham Books, 1979.
Atenció: Aquestes cites poden no estar 100% correctes.