stangl, werner; Robinson, Francis Pleasant (1970). Effective study. New York: Harper & Row. The PQRST Method of Studying. stangl-taller.at. [2009-02-01]. (原始内容存档于2009-02-02) (英语).引文使用过时参数coauthors (帮助)
stangl, werner; Robinson, Francis Pleasant (1970). Effective study. New York: Harper & Row. The PQRST Method of Studying. stangl-taller.at. [2009-02-01]. (原始内容存档于2009-02-02) (英语).引文使用过时参数coauthors (帮助)