APA

Pumpelly R., Wolff J. E. & Dale T. N. (1894). The Geology of the Green Mountains in Massaachusetts. Washington: Governmext Printing Office.

Chicago

Pumpelly R, Wolff J E and Dale T N. 1894. The Geology of the Green Mountains in Massaachusetts. Washington: Governmext Printing Office.

Harvard

Pumpelly R., Wolff J. E. and Dale T. N. (1894). The Geology of the Green Mountains in Massaachusetts. Washington: Governmext Printing Office.

MLA

Pumpelly R, Wolff J E and Dale T N. The Geology of the Green Mountains in Massaachusetts. Washington: Governmext Printing Office. 1894.