APA
Hayden R. C., Loehle R., . (1992). 7 African-American scientists. Frederick, Md: Twenty-First Century Books.
Chicago
Hayden Robert C, Loehle Richard, . 1992. 7 African-American scientists. Frederick, Md: Twenty-First Century Books.
Harvard
Hayden R. C., Loehle R., . (1992). 7 African-American scientists. Frederick, Md: Twenty-First Century Books.
MLA
Hayden Robert C, Loehle Richard, . 7 African-American scientists. Frederick, Md: Twenty-First Century Books. 1992.