Dennis, F. A. 2., & Castleton, D. A. 2. (1989). Case studies in population and natural resource: Costa Rica. [S.l.] , [S.l.] : [S.e.].
芝加哥风格引文Dennis, Frances Autoría 26056, 与 Dulce Autora 26057 Castleton. Case Studies in Population and Natural Resource: Costa Rica. [S.l.] , [S.l.] : [S.e.], 1989.
MLA引文Dennis, Frances Autoría 26056, 与 Dulce Autora 26057 Castleton. Case Studies in Population and Natural Resource: Costa Rica. [S.l.] , [S.l.] : [S.e.], 1989.
警告：这些引文格式不一定是100％准确.