APA (7th ed.) Citation
PORTNOY, S., & ET AL. (1989). FIVE-YEAR FOLLOW-UP STUDY OF EXTREMELY LOW-BIRTHWEIGHT INFANTS.
Chicago Style (17th ed.) Citation
PORTNOY, S., and ET AL. FIVE-YEAR FOLLOW-UP STUDY OF EXTREMELY LOW-BIRTHWEIGHT INFANTS. 1989.
MLA (9th ed.) Citation
PORTNOY, S., and ET AL. FIVE-YEAR FOLLOW-UP STUDY OF EXTREMELY LOW-BIRTHWEIGHT INFANTS. 1989.
Warning: These citations may not always be 100% accurate.