Warunee Ketsa-ard และ Parkorn Suwanich. (2011) Potential assessment of agro-tourism in Thawi Watthana district, Bangkok metropolis. Mahidol University:ม.ป.ท.Warunee Ketsa-ard และ Parkorn Suwanich. 2011. Potential assessment of agro-tourism in Thawi Watthana district, Bangkok metropolis. ม.ป.ท.:Mahidol University;Warunee Ketsa-ard และ Parkorn Suwanich. Potential assessment of agro-tourism in Thawi Watthana district, Bangkok metropolis. ม.ป.ท.:Mahidol University, 2011. Print.