shampoo
References
Parpola, M. (2000). Kerala Brahmins in transition: a study of a Namputiri family. In Studia Orientalia (pp. xii, 436). Finnish Oriental Society. ehraf link
soap
Sekaquaptewa, H., & Udall, L. (1969). Me and mine: the life story of Helen Sekaquaptewa. University of Arizona Press. ehraf link
Silva, A. B. A. da, & Lillios, I. (1962). The indigenous civilization of the Uaupés. In Centro de Pesquisas de Iauareté (p. HRAF MS: 749 [original: 496, plates]). Centro de Pesquisas de Iauareté. ehraf link
conditioner
Reich, C., & Su, D. T. (2001). Hair conditioners. In Handbook of cosmetic science and technology (pp. 347-362). CRC Press.
Hoshowski, M. A. (2018). Conditioning of hair. In Hair and Hair Care (pp. 65-104). Routledge.