Citing a paper that inspired your research is extremely common; refer to it the way you would any other background information that situates your work.
Some examples from a quick search of the arXiv (quotes are taken from the final published versions):
- Arch. Math. Logic 43 (2004) pp. 583-663:
In this realm we may classify forcing notions using the methods of ,  and, for example, declare that very Souslin (or generally ω–nw–nep) ccc forcing notions (see 1.3.1) are really nice. Both the Cohen forcing notion and the random forcing
notion and their FS iterations (and nice subforcings) are all ccc ω—nw—nep, and [22, Problem 4.24] asked if we have more examples. It occurs that our method relatively easily results in very Souslin ccc forcing notions (see 1.3.4(3), 1.5.8(2), 1.5.11, 1.5.15(3))
 Shelah, S.: On what I do not understand (and have something to say). Fundamenta Math. 166, 1—82 (2000) math.LO/9906113
- SIAM J. Discrete Math 16:1 (2003), pp. 99–113
In particular, we answer the question of
Erdős et al. [8, Problem B], who asked for the asymptotics of r̂(Ks,n, Ks,n).
 P. Erdős, R. J. Faudree, C. C. Rousseau, and R. H. Schelp, The size Ramsey number, Period. Math. Hungar., 9 (1978), pp. 145–161.