Gaya APA
Morgan, Helen L. (1977).
Maria Mitchell First Lady of American Astronomy .
America:
The Westminster Press.
Gaya Chicago
Morgan, Helen L.
Maria Mitchell First Lady of American Astronomy.
America:
The Westminster Press,
1977.
.
Gaya MLA
Morgan, Helen L.
Maria Mitchell First Lady of American Astronomy.
America:
The Westminster Press,
1977.
.
Gaya Turabian
Morgan, Helen L.
Maria Mitchell First Lady of American Astronomy.
America:
The Westminster Press,
1977.
.