Sehgal, R. (1994). Introduction to universal decimal classification. Ess Ess.
シカゴスタイル引用形Sehgal, R.L. Introduction to Universal Decimal Classification. New Delhi: Ess Ess, 1994.
MLA引用形式Sehgal, R.L. Introduction to Universal Decimal Classification. Ess Ess, 1994.
警告: この引用は必ずしも正確ではありません.