APA Style
Alerich,C.L. (1993).
Forest Statistics Pennsylvania-1978 and 1989 (USDA) .
Washington,D.C:
USDA Forest Service.
Chicago Style
Alerich,C.L.
Forest Statistics Pennsylvania-1978 and 1989 (USDA).
Washington,D.C:
USDA Forest Service,
1993.
.
MLA Style
Alerich,C.L.
Forest Statistics Pennsylvania-1978 and 1989 (USDA).
Washington,D.C:
USDA Forest Service,
1993.
.
Turabian Style
Alerich,C.L.
Forest Statistics Pennsylvania-1978 and 1989 (USDA).
Washington,D.C:
USDA Forest Service,
1993.
.