(页面存档备份,存于互联网档案馆)," American Heritage Magazine, 1968. 于2007年1月1日访问。 Thomas Leroy Hankins and Robert J. Silverman, Instruments and the Imagination (Princeton, N
mounted side by side." 存档副本. [2014-01-16]. (原始内容存档于2019-05-02). Thomas L. Hankins, Robert J. Silverman, Instruments and the Imagination, p. 157 Walter G