By Rowles, James..
Ciudad Universitaria Rodrigo Facio, Costa Rica Editorial Universitaria Centroamericana 1980 .
303 p. 17 cm..
8483601400

By Durham, William H..
Stanford, Calif. Stanford University Press 1979 .
xvii, 209 p. , Includes index. 23 cm..
0804710007

By Anderson, Thomas P..
Lincoln University of Nebraska Press 1981 .
xii, 203 p. , Includes index. 23 cm..
0803210094