EARTH SCIENCE UNDERSTANDING ENVIRONMENTAL SYSTEMS
EDGAR W.SPENCER著2222 年出版518 页ISBN:0072341467
Understanding food science and technology
Peter S Murano2003 年出版484 页ISBN:053454486X
UNDERSTANDING RESEARCH IN THE SOCIAL SCIENCES
CURTIS HARDYCK AND LEWIS F.PETRINOVICH1975 年出版224 页ISBN:
ECONOMIC METHODOLOGY UNDERSTANDING ECONOMICS AS A SCIENCE
2010 年出版209 页ISBN:9780230218123