Writing Skills Tutorial. Www.essex.ac.uk/myskills/How_to_improve_your_academic_writing.pdf. Unilearning Website. Referring to sources. General descriptions of the relevant literature A considerable amount of literature has been published on X. These studies .... There is a large volume of published studies describing the role of .... The first serious discussions and analyses of X emerged during the 1970s with .... General reference to previous research/scholarly activity (usually more than one author) Many historians have argued that ....
Recent evidence suggests that .... Several attempts have been made to .... Previous studies have reported .... Twenty cohort study analyses have examined the relationship between .... The relationship between X and Y has been widely investigated (Smith, 1985; Jones, 1987, .... Xs have been identified as major contributing factors for the decline of many species (1). It has been suggested that levels of X are independent of the size of the Y (Smith et al., 1995) It has conclusively been shown that X and Y increase Z (Smith et al., 1999; Jones, 2001 .... Some analysts (e.g. Welcome to the Writing Centre | The Writing Centre. UNE - ASOnline - ASO Online Workshops.