under the Wagner Act. U. Pa. L. Rev. & Amer. L. Reg. Mar 1941, 89 (5): 648–60. JSTOR 3309199. doi:10.2307/3309199. Keyserling, Leon H. The Wagner Act: Its
2010,第340頁. Wagner 2006, p. 34. Wagner 2006, p. 127. Roberts 2004, p. 206. Bradbury 1992, p. 176. Rogers 2010, p. 54. Wagner 2006, pp. 127-128. Wagner 2006,