APA
(1998). Principles of Horticulture. Oxford: Butterworth Heinemann.
Chicago
1998. Principles of Horticulture. Oxford: Butterworth Heinemann.
Harvard
(1998). Principles of Horticulture. Oxford: Butterworth Heinemann.
MLA
Principles of Horticulture. Oxford: Butterworth Heinemann. 1998.