Victor Grech. (2013). Secular trends in sex ratios at birth in South America over the second half of the 20th century. Brazilian Society of Pediatrics.
Chicago Style (17th ed.) CitationVictor Grech. Secular Trends in Sex Ratios at Birth in South America over the Second Half of the 20th Century. Brazilian Society of Pediatrics, 2013.
MLA (9th ed.) CitationVictor Grech. Secular Trends in Sex Ratios at Birth in South America over the Second Half of the 20th Century. Brazilian Society of Pediatrics, 2013.
Warning: These citations may not always be 100% accurate.