APA (7th ed.) Citation
CHRISTENSEN, K., & ET AL. (1999). A DANISH POPULATION-BASED TWIN STUDY ON GENERAL HEALTH IN THE ELDERLY.
Chicago Style (17th ed.) Citation
CHRISTENSEN, K., and ET AL. A DANISH POPULATION-BASED TWIN STUDY ON GENERAL HEALTH IN THE ELDERLY. 1999.
MLA (9th ed.) Citation
CHRISTENSEN, K., and ET AL. A DANISH POPULATION-BASED TWIN STUDY ON GENERAL HEALTH IN THE ELDERLY. 1999.
Warning: These citations may not always be 100% accurate.