This paper aims to investigate the use of reference and substitution as cohesion devices by advanced Korean EFL writers and English native writers. Twelve research articles (totaling 218 pages, 93,033 words) written in English were collected in academic journals. Half of the research articles were prepared by Koreans and the other half were written by native writers. Several demonstrative pronouns, personal pronouns and demonstrative adverbs were selected as referential cohesion devices for this study. Three substitutional cohesion devices were also chosen. Their frequency was investigated at first, after which their preference was analyzed. There was not much difference in the overall use of cohesion devices between the two groups. Some devices were used by Korean writers more often than native ones. Reasons for this could be high English proficiency of Korean writers, their hyper-correction or the influence of Korean culture. Other more distinctive cohesion features such as conjunctions are recommended for analysis of cohesion in future research.