Author-date referencing (or the Harvard system or Harvard style of parenthetical referencing) is common in articles published in Wikipedia, though Author-title referencing is also used in articles in Wikipedia; both styles are acceptable citation formats in Wikipedia.nder the author-date referencing system, a book is cited in the text in parentheses, after the section, sentence, or paragraph for which the book was used as a source, using the surname of the author and the year of publication only, with the parentheses closing before the period, as in (Author 2005) .
But John Hughes Benett was the first person to legally discovered leukemia in 1845 in Edinburgh. Later on, in the 19th century, many European scientists found out that there were some people who suffered from abnormal and excess production of white blood cells. They called it as weisses blut that means white blood.
Leukemia (American English) or leukaemia (British English) is a group of cancers that usually begin in the bone marrow and result in high numbers of abnormal white blood cells. These white blood cells are not fully developed and are called blasts or leukemia cells.n children with acute leukemia who are cancer-free after five years, the cancer is unlikely to return. In 2012, leukemia developed in 352,000 people globally and caused 265,000 deaths. It is the most common type of cancer in children, with three quarters of leukemia cases in children being ALL.