@article {Vok1984,
	title = {PLTIT: A graphing package for the Apple II series of computers},
	journal = {Behavior Research Methods, Instruments, \& Computers},
	volume = {16},
	number = {5},
	year = {1984},
	pages = {483{\textendash}483},
	publisher = {Springer},
	author = {Vokey, John R}
}
