Hajela, T. N. (1983). Principles, problems and practice co-operation (4 edition.). Shiva Lal Agarwal & Company.
シカゴスタイル引用形Hajela, T N. Principles, Problems and Practice Co-operation. 4 edition. Agra: Shiva Lal Agarwal & Company, 1983.
MLA引用形式Hajela, T N. Principles, Problems and Practice Co-operation. 4 edition. Shiva Lal Agarwal & Company, 1983.
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