@book{Knowles,2012,
author = {Knowles, M. and Holton, E. and Swanson, R.},
title = {The adult learner: The definitive classic in adult education and human resource development},
edition = {7th},
year = {2012},
publisher = {Routledge},
language = {English},
url = {www.amazon.com/The-Adult-Learner-Malcolm-Knowles/dp/1856178110}
}