Which citation correctly uses mla style to present this information? authors: jennifer laing, warwick frost article title: how green was my festival – exploring challenges and opportunities associated with staging green events journal name: international journal of hospitality management year of publication: 2010 medium of publication: print volume number: 29 issue number: 2 page numbers: 261–267 a: laing, jennifer & frost warwick. how green was my festival: exploring challenges and opportunities associated with staging green events. international journal of hospitality management 29 (2) (2010): 261–7. print. b: laing, j and frost w. how green was my festival: exploring challenges and opportunities associated with staging green events. “international journal of hospitality management.” (29.2) 2010: 261–7. print. c: laing, jennifer, and warwick frost. “how green was my festival: exploring challenges and opportunities associated with staging green events.” international journal of hospitality management 29.2 (2010): 261–7. print. d: jennifer, laing, and warwick frost. “how green was my festival: exploring challenges and opportunities associated with staging green events.” international journal of hospitality management (29.2) 2010: 261–267. print.