- Author: Debebow Zelelie, Mulugeta Andualem, Serge Obolensky, United States. Foreign service institute.
- Language: English
- Year: 1965
- Author: Foreign Service Institute (U.S.)
- Language: English
- Year: 1989
- Author: Foreign Service Institute (U.S.)
- Language: English
- Year: 1967
- Author: Janko N. Jankovic, Carleton Taylor Hodge, Foreign Service Institute (U.S.)
- Language: Croatian
- Year: 1968
- Author: Foreign Service Institute (U.S.)
- Language: English
- Year: 1968
- Author: Earl W. Stevick, Paul G. Imhoff, Marianne Lehr, Foreign Service Institute (U.S.)
- Language: English
- Year: 1966
- Author: Foreign Service Institute (U.S.), Ingrid Beach
- Language: English
- Year: 1982
- Author: Earl W. Stevick, Paul G. Imhoff, Marianne Lehr, Foreign Service Institute (U.S.)
- Language: English
- Year: 1966
- Author: Selman Ağralı, Lloyd Balderston Swift, Foreign Service Institute (U.S.)
- Language: English
- Year: 1968
- Author: Selman Ağralı, Lloyd Balderston Swift, Foreign Service Institute (U.S.)
- Language: English
- Year: 1966
