Gaya APA
Sargent, L, G, &, D. (1981).
Countdown to Mathematics Volume 2 (1).
England:
addison-wesley publishers limited.
Gaya MLA
Sargent, Lynne, Graham, &, David.
"Countdown to Mathematics Volume 2".
1
England:
addison-wesley publishers limited,
1981.
Buku Analog.