Unknown. (2023). Calendar - Imperial Forest School. Superintendent of Government Printing, Government of India, Calcutta.
芝加哥风格引文Unknown. Calendar - Imperial Forest School. Superintendent of Government Printing, Government of India, Calcutta, 2023.
MLA引文Unknown. Calendar - Imperial Forest School. Superintendent of Government Printing, Government of India, Calcutta, 2023.
警告：这些引文格式不一定是100％准确.