APA

Richards P., Slikkerveer L. J. & Phillips A. O. (1989). Indigenous knowledge systems for agriculture and rural development. Ames, Iowa, USA: Technology and Social Change Program , Iowa State University in collaboration with the Academy for Educational Development, Washington, D.C. USA.

Chicago

Richards Paul, Slikkerveer L J and Phillips Adedotun O. 1989. Indigenous knowledge systems for agriculture and rural development. Ames, Iowa, USA: Technology and Social Change Program , Iowa State University in collaboration with the Academy for Educational Development, Washington, D.C. USA.

Harvard

Richards P., Slikkerveer L. J. and Phillips A. O. (1989). Indigenous knowledge systems for agriculture and rural development. Ames, Iowa, USA: Technology and Social Change Program , Iowa State University in collaboration with the Academy for Educational Development, Washington, D.C. USA.

MLA

Richards Paul, Slikkerveer L J and Phillips Adedotun O. Indigenous knowledge systems for agriculture and rural development. Ames, Iowa, USA: Technology and Social Change Program , Iowa State University in collaboration with the Academy for Educational Development, Washington, D.C. USA. 1989.