O`Sullivan, D., Swan, M., Walter, C. The new cambridge english course 4. Cambridge: Cambridge Univ. Press, 1993 153 p.: ill. 0-521-37652-1.
O`Sullivan, D., Swan, M., Walter, C. The new cambridge english course 4. Cambridge: Cambridge Univ. Press, 1993 153 p.: ill. 0-521-37652-1.
O`Sullivan, D., Swan, M., Walter, C. (1993) The new cambridge english course 4, Cambridge: Cambridge Univ. Press 153 p.: ill. 0-521-37652-1.
O`Sullivan, D., Swan, M., & Walter, C. (1993). The new cambridge english course 4. Practice : Upper-intermediate. Cambridge: Cambridge Univ. Press, 153 p.: ill.
O`Sullivan D, Swan M, Walter C. The new cambridge english course 4: Practice : Upper-intermediate. Cambridge: Cambridge Univ. Press; 1993. p. 153 p.: ill. ISBN: 0-521-37652-1.
