@inproceedings{sgem2018S04116,
  title = {VOLUNTEERING: TRENDS OF DEVELOPMENT IN ECOLOGICAL TOURISM},
  author = {P. Natalia and F. Alexander and V. Olga and K. Tatiana},
  booktitle = {5th International Multidisciplinary Scientific Conference on Social Sciences and Arts SGEM 2018},
  year = {2018},
  pages = {937-944},
  publisher = {STEF92 Technology},
  doi = {10.5593/sgemsocial2018/1.3/S04.116}
}