Siriwachirapap, Walaiporn, Peeradet Tong-umpai, and Saichol Ketsa. 1985. “Harvesting Indices of ’Cardinal’ Grape”. Agriculture and Natural Resources 19 (3). Bangkok, Thailand:167-72. https://li01.tci-thaijo.org/index.php/anres/article/view/242439.