Further development of pictorial semantic differential PSD for product perception analysis - Raja Ahmad Effendi, Raja Ahmad Azmeer; Md Hashim, Azhari; Wongtanasuporn, Palang; Dolah, Mohd Shahrizal; Ramli, Saiful Hasley; Busri, Saharudin; Awang Kechil, Sharuddin (Universiti Putra Malaysia Press, 2016)