APA
Pedersen K. S., Fredenslund A., Thomassen P., Fredenslund A. & Thomassen P. (1989). Properties of oils and natural gases. Houston: Gulf Publishing.
Chicago
Pedersen K S, Fredenslund Aage, Thomassen P, Fredenslund Aage and Thomassen P. 1989. Properties of oils and natural gases. Houston: Gulf Publishing.
Harvard
Pedersen K. S., Fredenslund A., Thomassen P., Fredenslund A. and Thomassen P. (1989). Properties of oils and natural gases. Houston: Gulf Publishing.
MLA
Pedersen K S, Fredenslund Aage, Thomassen P, Fredenslund Aage and Thomassen P. Properties of oils and natural gases. Houston: Gulf Publishing. 1989.