A. H.  Alfarhan, Chaudhary, S. A., and Thomas, J., ?The flora of Saudi Arabia?, JOURNAL-KING SAUD UNIVERSITY SCIENCEJOURNAL-KING SAUD UNIVERSITY SCIENCE, vol. 10, pp. 31-40, 1998.

A. H.  Alfarhan, Chaudhary, S. A., and Thomas, J., ?Notes on the flora of Saudi Arabia?, JOURNAL-KING SAUD UNIVERSITY SCIENCEJOURNAL-KING SAUD UNIVERSITY SCIENCE, vol. 10, pp. 31-40, 1998.