Referencing a paper from a published conference proceedings
Page numbers must be included.
Monetary value is not the true value of a purchased item – Vargo and Lusch (cited in Graham, 2011, p. 145) “introduced the idea that value can only be created and acknowledged by the consumer in the act of consumption”.
Supply DOI where available, or URL (shorten URL) in the absence of DOI.
Page numbers may be required.
Another perspective is that of Vargo and Lusch (cited in Graham, 2011), who propose that it is the purchaser that gives a purchased item its value.
Graham, G. (2011). Interaction space. Workshop proceedings of the 7th international conference on intelligent environments. (pp.145-154). IOS Press, EBSCOhost eBook Collection. Retrieved from http://web.a.ebscohost.com/ehost/.