Uppal, O. P. (1975). Practical Procedure of Classification. Madan Publishers.
シカゴスタイル引用形Uppal, Om Prakash. Practical Procedure of Classification. Patiala: Madan Publishers, 1975.
MLA引用形式Uppal, Om Prakash. Practical Procedure of Classification. Madan Publishers, 1975.
警告: この引用は必ずしも正確ではありません.