Gaya APA
Cross, J, B, &, A. (2021).
Cambridge Primary Science Learner's Book 1 Second Edition (Cetakan kedua).
England:
Cambridge University Press.
Gaya MLA
Cross, Jon, Board, &, Alan.
"Cambridge Primary Science Learner's Book 1 Second Edition".
Cetakan kedua
England:
Cambridge University Press,
2021.
.