APA (7th ed.) Citation

Lawrence, T., Toll, J., & van Stolen, D. H. (1986). Directory of germplasm collections. IBPGR.

Chicago Style (17th ed.) Citation

Lawrence, T., J. Toll, and D. H. van Stolen. Directory of Germplasm Collections. Rome: IBPGR, 1986.

MLA (8th ed.) Citation

Lawrence, T., et al. Directory of Germplasm Collections. IBPGR, 1986.