Gussekloo, J., Heijmans, B., Slagboom, P., Lagaay, A., Knook, D., & Westendorp, R. (1999). Thermolabile methylenetetrahydrofolate reductase gene and the risk of cognitive impairment in those over 85. BMJ Group.

Gussekloo, J., B. Heijmans, P. Slagboom, A. Lagaay, D. Knook, và R. Westendorp. Thermolabile Methylenetetrahydrofolate Reductase Gene and The risk of Cognitive Impairment in Those Over 85. BMJ Group, 1999.

Gussekloo, J., et al. Thermolabile Methylenetetrahydrofolate Reductase Gene and The risk of Cognitive Impairment in Those Over 85. BMJ Group, 1999.