Bold, H. C. (1970). The plant kingdom (3rd ed.). Prentice-Hall.
Cita Chicago (17th ed.)Bold, Harold Charles. The Plant Kingdom. 3rd ed. Englewood Cliffs, New Jersey: Prentice-Hall, 1970.
Cita MLA (9th ed.)Bold, Harold Charles. The Plant Kingdom. 3rd ed. Prentice-Hall, 1970.
Atenció: Aquestes cites poden no estar 100% correctes.