- Author: G. Ciucu V. Craiu
- Language: Romanian
- Year: 1971
- Author: Monica Dumitrescu Dorel Florea Constantin Tudor
- Language: Romanian
- Year: 1985
- Author: George Ciucu Virgil Craiu Ion Săcuiu
- Language: Romanian
- Year: 1974
- Author: George Ciucu Virgil Craiu
- Language: Romanian
- Year: 1968
Basic Statistics
pdf
- Author: Seemon Thomas
- Language: English
- Year: 2014
- Author: Tanya Cook, Chris Forest
- Language: English
- Year: 2011
- Author: Sarah Mosoetsa, Michelle Williams, International Labour Office Staff
- Language: English
- Year: 2012
- Author: Monica C Witkowski
- Language: English
- Year: 2012
- Author: Stephen M. Stigler
- Language: English
- Year: 2016