1) Siami, T., & Abdi, R. (2010). Threshold level English. Ardabil: Yavarian.

2) Abdi, R. & Siami, T. (2012). Freshman English. Ardabil: Mohaghagh Ardabili Press.

3) Abdi, R., & Siami, T. (2014). New Freshman English. Ardabil: Mohaghegh Ardabili Press. 

4) Abdi, R., Mosalli, Z., & Abdi, J. (2015). English for the students of travel and tourism. Ardabil: Mohaghegh Ardabili Press.

5) Abdi, R., Abdi, J., & Mosalli, Z. (2015). English for the students of Economics and Commerce. Ardabil: Mohaghegh Ardabili Press.

6) Siami, T., & Abdi, R. (2016). Refresh Your Englsih. Ardabil: Mohaghegh Ardabili Press.