APA

Moore A. W., . (1981). Tour guides as a factor in national park management. : .

Chicago

Moore Alan W, . 1981. Tour guides as a factor in national park management. : .

Harvard

Moore A. W., . (1981). Tour guides as a factor in national park management. : .

MLA

Moore Alan W, . Tour guides as a factor in national park management. : . 1981.