Nasruddin Hassan, and Bushra Abdul Halim, (2012) Pemodelan matematik dalam pengurusan Aktiviti Pelancongan Rekreasi di Wetland Putrajaya (Mathematical modelling approach to the management of recreational tourism activities at Wetland Putrajaya). Sains Malaysiana, 41 (9). pp. 1155-1161. ISSN 0126-6039