1. Clark, G., 1973. Staining procedures used by the Biological Stain Commission. 3rd ed. Williams & Wilkin s Co., Baltimore, 418 pp.
2. Fyfe, M. L., 1937. The reproductive system of the planarian Artiopos thia triangulata (Dendy). Q. J. micro sc. Sci 80: 99–126.
3. Gabe, M., 1976. Histological techniques. Masson, Paris, 1106 pp.
4. Henderson, C., 1989. Aminoalkylsilane: an inexpensive, simple preparation for slide adhesion. J. Histotechnol. 12: 123–124.
5. Hollander, D. H. & J. K. Frost, 1971. Antiox idant inhibition of stain fading and mounting medium crazing. Acta cytol. 15: 419.