Meyer, P. A. (1975). A comparison of direct questioning methods for obtaining dollar values for public recreation and preservation. Environment Canada, Fisheries and Marine Service.
芝加哥风格引文Meyer, Philip A. A Comparison of Direct Questioning Methods for Obtaining Dollar Values for Public Recreation and Preservation. Vancouver?: Environment Canada, Fisheries and Marine Service, 1975.
MLA引文Meyer, Philip A. A Comparison of Direct Questioning Methods for Obtaining Dollar Values for Public Recreation and Preservation. Environment Canada, Fisheries and Marine Service, 1975.
警告:这些引文格式不一定是100%准确.