Sangatanan, Pedro D. Practical guide to organic gardening / Pedro D. Sangatanan, Rone L. Sangatanan. - Quezon City : Busybook Distributors, c2000. - 184p. : ill. ; 23 cm. - Technology and livelihood series . Cover title. References : p. 179 - 181. ISBN: 9717471878 paper back (n. p.) Subjects--Topical Terms: Organic gardening--Philippines.