APA (7th ed.) Citation

Royal Horticultural Society (Great Britain), Bryan, J. E., & Griffiths, M. (1995). Manual of bulbs. Timber Press.

Chicago Style (17th ed.) Citation

Royal Horticultural Society (Great Britain), John E. Bryan, and Mark Griffiths. Manual of Bulbs. Portland, Or.: Timber Press, 1995.

MLA (9th ed.) Citation

Royal Horticultural Society (Great Britain), et al. Manual of Bulbs. Timber Press, 1995.