APA Style
Helrich, Kenneth. (1990).
Official Methods of Analysis of The Association of Official Analytical Chemists (15th.ed).
Virginia:
Association of Official Analytical Chemists.
Chicago Style
Helrich, Kenneth.
Official Methods of Analysis of The Association of Official Analytical Chemists.
15th.ed
Virginia:
Association of Official Analytical Chemists,
1990.
Textbook.
MLA Style
Helrich, Kenneth.
Official Methods of Analysis of The Association of Official Analytical Chemists.
15th.ed
Virginia:
Association of Official Analytical Chemists,
1990.
Textbook.
Turabian Style
Helrich, Kenneth.
Official Methods of Analysis of The Association of Official Analytical Chemists.
15th.ed
Virginia:
Association of Official Analytical Chemists,
1990.
Textbook.