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Ahmed Osumanu Haruna, . (2014) Effects of humic hubstances isolated from different sources on nutient use efficiency and selected soil chemical properties. In: Humic substances and urea use in agriculture. Universiti Putra Malaysia Press, Selangor Malaysia, pp. 125-165. ISBN 9.7896734441e+12
Ahmed Osumanu Haruna, . (2014) Humic substances. In: Humic substances and urea use in agriculture. Universiti Putra Malaysia Press, Selangor Malaysia, pp. 12-30. ISBN 9.7896734441e+12
Ahmed Osumanu Haruna, . (2014) Isolation of humic substances. In: Humic substances and urea use in agriculture. Universiti Putra Malaysia Press, Selangor Malaysia, pp. 41-56. ISBN 9.7896734441e+12
Ahmed Osumanu Haruna, . (2014) Minimizing urea-N loss through the use of humic substances. In: Humic substances and urea use in agriculture. Universiti Putra Malaysia Press, Selangor Malaysia, pp. 93-124. ISBN 9.7896734441e+12
Ahmed Osumanu Haruna, . (2014) Sources of humic substances. In: Humic substances and urea use in agriculture. Universiti Putra Malaysia Press, Selangor Malaysia, pp. 31-40. ISBN 9.7896734441e+12
Teh Christopher Boon Sung, . and Wan Zaliha Wan Sembok, . and Rosazlin Abdullah, . and Adzemi Mat Arshad, . and Che Fauziah Ishak, . and Ahmed Osumanu Haruna, . and Jeyanny Vijayanathan, . (2016) Proceedings of the Soil Science Conference of Malaysia 2016: soil improvement for sustainable crop production TH Hotel & Convention Centre Kuala Terengganu Terengganu 5-7 April 2016. Malaysian Society of Soil Science, Selangor Malaysia. ISBN 978-967-9945386
Ahmed Osumanu Haruna, . (2013) Humic substances and urea use in agriculture. Universiti Putra Malaysia Press, Selangor Malaysia. ISBN 9.7896734441e+12
Ahmed Osumanu Haruna, . and Ahmad Husni Mohd Hanif, . and Anuar Abd Rahim, . and Mohd Hanafi Musa, . (2013) Sustainable production of pineapples on tropical peat soils. Universiti Putra Malaysia Press, Serdang Selangor Malaysia. ISBN 978-967-344-347-5
