APA
Helgeson J. P., Ingram D. S., . (1980). Tissue culture methods for plant pathologists. Oxford: Blackwell.
Chicago
Helgeson J P, Ingram D S, . 1980. Tissue culture methods for plant pathologists. Oxford: Blackwell.
Harvard
Helgeson J. P., Ingram D. S., . (1980). Tissue culture methods for plant pathologists. Oxford: Blackwell.
MLA
Helgeson J P, Ingram D S, . Tissue culture methods for plant pathologists. Oxford: Blackwell. 1980.