@book{17773,
	author = {Jong, B. H. J. de.},
	title = {A revision of the african species of Alstonia R. Br. (Apocynaceae)},
	publisher = {Veenman & Zonen,},
	year = {1979},
	series = {Mededelingen landbowhogeschool},
	address = {Wageningen :}
}