@book{5391,
	author = {Das , B. C. and Mukherjee , B. N.},
	title = {Higher Trigonometry /},
	publisher = {U. N. Dhur & Sons Pvt. Ltd.,},
	year = {c1933 [repriented 1993].},
	address = {Calcutta :},
	edition = {26th ed.}
}