Klein, B., Klein, S.: A szervezet lelke. Edge 2000 Kft, Budapest, 923 p., 2012. ISBN: 9789639760226
2008
Klein, B., Klein, S., Joubert, K., Gyenis, G.: The social cage - Socio-economic status and intelligence in Hungary. In: Uses and Abuses of Intelligence : Studies Advancing Spearman and Raven's Quest for Non-Arbitrary Metrics. Ed.: John Raven, Jean Raven, Royal Fireworks Press, New York, 568-593, 2008. ISBN: 9780898243567