An article titled "research methods in economics" written by tom nunan and susan walker in 2014 and published in the journal for economics in volume 2 issue 3 the article is from page 113 to 150

I'm assuming that you want this in the form of Harvard Referencing. 

[Author Surname], [Author Initial.] ([Year Published]) [Title].[Publication Title], [Volume number]([Issue number]), [Pages Used]. 

All you have to do now is fill in the gaps: 

Nuna, T and Walker, S . (2014). Research methods in Economics.Journal for Economics. 2 (3), 113 - 150.