How to refer to other objects?

Greetings,
I'm not sure how objects should refer to other objects.
Example:
Class Automobile needs to refer to objects from other classes, namely to tires, color, motor and company.
So, the way I would do this in C++ or VB is to store all tire, color, motor and company objects into arrays and then store Integer ids in class automobile refering to the index. Like
tiresId
colorId
motorId
companyId
So if I would like to know the name of the company of this automobile, I would have to do the following:
company(automobile.getCompanyId).name
I'm not sure however if this is the right OOP-Way of doing it. Should I rather put object references into class automobile instead so that I would only have to
automobile.getCompany ?
The problem I have with this solution is that I have to read and store the automobile data into files and while it's pretty easy to store an integer-id I'm not sure on how to store object references. They are a little "obscure" to me on this point.
Thanks in advance for any advice.

if you just want to save the type of company, color and so on for every automobile, i think integer ID is a good way,
similar to the existing Color-class with constants:
Color.BLACK, Color.RED, ..
the way with references would also work, then all referenced objects will be saved too,

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