Heldt, H., & Piechulla , B. Plant biochemistry (4th ed.).
Cita Chicago (17th ed.)Heldt, Hans-Walter, i Birgit Piechulla. Plant Biochemistry. 4th ed.
Cita MLA (9th ed.)Heldt, Hans-Walter, i Birgit Piechulla. Plant Biochemistry. 4th ed.
Atenció: Aquestes cites poden no estar 100% correctes.