Struct that contains a pointer to itself

#include <stdio.h>

struct a{
    int f;
    struct a *next;
};

int main(){
    struct a zebra, dilma;
    zebra.f=10;
    dilma.f=20;
    zebra.next=&dilma;

    printf("Ponteiro de zebra para dilma:%d\n", (zebra.next)->f);
    printf("Zebra %d\n", zebra.f);
    zebra.f=(zebra.next)->f;
    printf("Zebra %d\n", zebra.f);

    return 0;
}