Gaya APA

Tekalign, T. et al (1991). Working Dokument: Soil, Plant, Waters, Fertilizer, Animal Manure, & Compost analysis Manual . Ethiopia: Soil Science & Plant Nutrion Section.

Gaya MLA

Tekalign, Tadesse. et al. "Working Dokument: Soil, Plant, Waters, Fertilizer, Animal Manure, & Compost analysis Manual". Ethiopia: Soil Science & Plant Nutrion Section, 1991. Text.