J. A.  McGimpsey, Douglas, M. H., VanKlink, J. W., Beauregard, D. A., and Perry, N. B., ?Seasonal variation in essential oil yield and composition from naturalized Thymus vulgaris L. in New Zealand?, Flavour and Fragrance Journal, vol. 9, no. 6, pp. 347 - 352, 1994.

A. C.  Figueiredo, Miguel, M. G., Duarte, A. M. F., Barroso, J. G., and Pedro, L. G., ?Essential oil composition of Thymus lotocephallus G. Lo?pez & R. Morales, collected during flowering and vegetative phases?, Flavour and Fragrance Journal, vol. 16, no. 6, pp. 417 - 421, 2001.