Kotagama S,W. – PICTORIAL GUIDE TO COMMON BIRDS OF SRI LANKA. 2000. FOGSL Publication. pp 40. 31 plates.
Kotagama, S.W. & A. Padmaperuma – PARISARA VIDYAWA – Sarala vigrahayak. (Sinhala – Ecology a simple analysis). 2000, FOGSL publication.
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FLORA AND FAUNA
Sabaragamuwa Wansakathawa. Chapter 2, December: pp 694-696
Kotagama, S.W. & J Jinasena (artist) – ENDEMIC BIRDS OF SRI LANKA. Wildlife Heritage Publication, 2000 . Limited edition 750 copies.
Kotagama, S.W. & Athula Wijesinhe – SIRI LAKA KURULLO (Sinhala – Birds of Sri Lanka). 568pp, 150 pictures. Wildlife Heritage Publication, 1998
Kotagama, S.W. – KURULU LOWATA PIVISUMA – 1, (Sinhala – Enter the Bird World –1). 78pp, FOGSL publication, 1999