1. Bachnik J., Time Space and Person. In Hendry J., Japanese relationships’ in Interpreting Japanese society anthropological approaches. 2nd ed. London: Routledge, 94 (1998)
2. Bejou D., Palmer A., The future of relationship marketing. New York: Best Business Books (2006)
3. Berry L. L., Parasuraman A., Marketing services: competing through quality. New York: The Free Press, 136–139 (1991)
4. Biswas S., Relationship marketing: concepts, theories and cases. Delhi: PHI Learning Private Limited, 2–4 (2014)
5. Brennan R., Canning L., McDowell R., Business-to-Business marketing. London: SAGE publications ltd., 73 (2007)