APA
Gitachlow P., . (1983). Mastering chemistry. Singapur: Toppan Printing Company.
Chicago
Gitachlow P, . 1983. Mastering chemistry. Singapur: Toppan Printing Company.
Harvard
Gitachlow P., . (1983). Mastering chemistry. Singapur: Toppan Printing Company.
MLA
Gitachlow P, . Mastering chemistry. Singapur: Toppan Printing Company. 1983.