求助英文文献两篇：

   第一篇篇名：Toward a coherent theory of environmentally significant behavior

  作者：Stern, P. C.        (2000)

  Journal of Social Issues, 56(3), 407–424.

  第二篇篇名：Values,
   values，beliefs, and proenvironmental action: Attitude formation toward emergent attitude objects.

  作者：Stern, P. C., Dietz, T., Kalof, L., & Guagnano, G. A.        (1995)

  Journal of Applied Social Psychology, 25(18), 1611–1636.

万分感谢！！！